Genesis 17

The words “be blameless” are addressed to Abraham, to whom had been given the spirit of wisdom, holy, marvelously agile, unpolluted. The soul of the just man, therefore, must be in training night and day, ever on the lookout, never indulging in sleep but on perpetual watch, intent on God, so as to understand the things that are and to comprehend the causes of each. But wisdom is also the interpreter of future things: “She knows the things of old and infers the things to come. She understands turns of speech and the solutions of riddles. She has foreknowledge of signs and wonders and of the outcome of seasons and times.” One who has obtained her, therefore, cannot but be good and perfect, because he possesses every virtue and is the very image of goodness. Even the sophists of this world drew from this text a definition of such a wise man: The wise man is (by definition) a good man and an accomplished communicator.

On Abraham

After the tenth year he took Ishmael, his child by the maidservant, and considered that the promises had been fulfilled for him in the child. The patriarch was, you remember, the text tells us, eighty-six years old when Ishmael was born. The loving God, however, exercised the virtue of the just man for a still further period of thirteen years. When God saw that he had been purified like gold in a furnace for a long period of time and had rendered the just man’s virtue more conspicuous and resplendent, Scripture says, “When Abram was ninety-nine years old, God appeared to him again.” Why did God delay so long? Not simply that we should get to know the just man’s endurance and his great virtue, but for us to see as well the extraordinary degree of his power. You see, when nature lost its potency and was now useless for childbearing, his body being wasted and chilled with old age, God put into effect the promise to demonstrate his peculiar power.

Homilies on Genesis 39.5

After he had turned ninety-nine years old, the Lord appeared to him and said, "I am the Almighty God; walk before me and be perfect. I will establish my covenant between me and you, and I will greatly multiply you exceedingly." Hence, the name of Abraham is amplified at the age of one hundred years, the covenant of circumcision is given, and the promise of the birth of Isaac is made, so that in a great mystery, a one-hundred-year-old receives the son of promise already circumcised. He walks before the Lord to be able to be perfect, who every moment remembers himself to be standing in the sight of the Divinity and as if placed in his service; as Elias, who said, "The Lord lives, in whose sight I stand" (1 Kings 17:1); he always indicated that he kept himself prepared for divine service, having the presence of his Creator in mind; and because the first step of perfection is humility, it is rightly added:

Commentary on Genesis (Hexaemeron)

Abram fell face down. We read that in the earlier places of sacred history, holy men invoked the Lord, offered him sacrifices of praise, and lived innocently in his sight, but none had fallen face down before the Lord before Abram. However, the more superior gifts he received compared to the previous ones, the greater thanks he gave to the Giver of gifts by humbling himself; and because in falling to the ground he humbly recalled his fragility, he immediately deserved to sublimely recognize the eminence of divine power. For it follows:

Commentary on Genesis (Hexaemeron)

(Chapter 17—Verse 3 and following) And the Lord spoke to him, saying: Behold, my covenant is with you, and you shall be the father of a multitude of nations. It should be noted that wherever we read Testament in Greek, in the Hebrew language it is the word covenant or pact, that is, Berith ().

Hebrew Questions on Genesis

And God said to him: I am, and my covenant is with you. For what is it for the Lord to say: I am, if not to clearly declare the state of his eternity, in which he is always the same? About which the Psalm also says: But you are the same (Psalm 102:28). This place harmonizes with the Gospel where the Lord said to the Jews: Before Abraham was, I am (John 8:58). For appearing in the flesh, he taught that he himself was the one who had once appeared to Abraham in spirit, when he repeated to the Jews the same testimony of his essence that he had given to Abraham; but the Jews were troubled because they had heard: Before Abraham was, I am; yet Abraham rejoiced when he heard: I am, and did not doubt that God existed before he did; hence, because he faithfully heard the word of divine eternity, he received in the increase of reward that he would be called and be the father of many nations. Moreover, the Jews, because they could not grasp the mysteries of divinity they'd heard, were cast out from the lineage of Abraham, and were counted among the offspring of vipers: Finally, they took up stones to throw at him; but he hid himself from them, and went out of the temple (John 8:59), so that, evidently hidden from their stony hearts, and going out, he would come to reveal to the Gentiles the knowledge of his majesty. For even then having gone out of the temple, he restored sight to the man born blind. Evidently as a figure of grace, with which he was to enlighten the hearts of the Gentiles. It follows:

Commentary on Genesis (Hexaemeron)

For the promise, that he should be the heir of the world, was not to Abraham, or to his seed, through the law, but through the righteousness of faith. For if they which are of the law be heirs, faith is made void, and the promise made of none effect: Because the law worketh wrath: for where no law is, there is no transgression. Therefore it is of faith, that it might be by grace; to the end the promise might be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham; who is the father of us all, (As it is written, I have made thee a father of many nations,) before him whom he believed, even God, who quickeneth the dead, and calleth those things which be not as though they were. [Genesis 17:5] Who against hope believed in hope, that he might become the father of many nations; according to that which was spoken, So shall thy seed be. And being not weak in faith, he considered not his own body now dead, when he was about an hundred years old, neither yet the deadness of Sara's womb: He staggered not at the promise of God through unbelief; but was strong in faith, giving glory to God; And being fully persuaded that, what he had promised, he was able also to perform. And therefore it was imputed to him for righteousness. Now it was not written for his sake alone, that it was imputed to him; But for us also, to whom it shall be imputed, if we believe on him that raised up Jesus our Lord from the dead; Who was delivered for our offences, and was raised again for our justification.

Many responses are given to Abraham by God, but they are not all delivered to one and the same man. For some are to Abram and some to Abraham; that is, some are expressed after the change of name and others while he was still known by his name given at birth. And first indeed, before the change of name, God delivered to Abraham the oracle that says, “Go out from your country and from your kindred and from your father’s house,” and the rest. But no order is given in this about the covenant of God, no order about circumcision. For it was not possible while he was still Abram and was bearing the name of his physical birth to receive the covenant of God and the mark of circumcision. But when “he went out from his country and his kindred,” then responses of a more sacred kind are delivered to him at this time. First God says to him, “You shall no longer be called Abram, but Abraham shall be your name.” Then at once he received the covenant of God and accepted circumcision as a sign of faith that he could not accept while he was still in his father’s house and in the relationship of flesh and while he was still called Abram.

Homilies on Genesis 3.3

For a name is changed, with a letter added, so that he would be called Abraham instead of Abram, which means 'father of a multitude', as the Latin interpretation has it, or 'sublime father', 'chosen father'; or so that he would become a father and the father of a son. He was vain when he did not know God; he became chosen after he knew God. He was a father when he had offspring by a slave woman; but he was not the father of a son, because he did not have a son who was conceived in lawful marriage. Sarah gave birth, and he became the father of a son.

On Abraham

(Chapter 17, Verse 5) And your name shall no longer be called Abram, but your name shall be Abraham, for I have made you the father of many nations. The Hebrews say that God, from his name, which is the Tetragrammaton among them, added the letter He to Abraham and Sarah: for he was first called Abram (), which means lofty father, and later he was called Abraham (), which means father of many: for what follows nations is not part of the name, but is understood. It is not surprising, therefore, that when it seems that the letter Α has been added among the Greeks and us: we have called it the Hebrew letter He added; for the language of that tongue is to write with He (ה‎), but to read with A (א‎): just as, on the contrary, the letter A is often pronounced as He.

Hebrew Questions on Genesis

Verse 7. "And the overseer of the eunuchs imposed names upon them, calling Daniel Belteshazzar (Balthasar), and Hananiah Shadrach, and Mishael Meshach, and Azariah Abednego." It was not only the overseer or master of the eunuchs (as others have rendered it, the "chief-eunuch") who changed the names of saints, but also Pharaoh called Joseph in Egypt Somtonphanec (Genesis 41:45), for neither of them wished them to have Jewish names in the land of captivity. Wherefore the prophet says in the Psalm: "How shall we sing the Lord's song in a strange land?" (Psalm 137:4). Furthermore the Lord Himself changes names benignly, and on the basis of events imposes names of special significance, so as to call Abram Abraham (Genesis 17:5), and Sarai Sarah (Genesis 17:15). Also in the Gospel, the former Simon received the name of Peter (Mark 3:16), and the sons of Zebedee are called "sons of thunder" (Mark 3:17) - which is not boanerges, as most people suppose, but is more correctly read benereem.

St. Jerome, Commentary on Daniel, CHAPTER ONE

However, a question arises here which should not be passed over and which may perhaps also, quite independently, be bothering some of you. What does it mean, that when the name of Abraham, this man Jacob’s grandfather, was changed (he was previously called Abram, you see, and God changed his name and said, you shall not be called Abram, but Abraham)? From that time on he was never called Abram. Search in the Scriptures, and you will see that earlier on, before he received another name, he was only called Abram. After he had received the new one, he was only called Abraham. This man Jacob, however, heard the same words when he received another name: You shall not be called Jacob, but you shall be called Israel. Now search the Scriptures, and see how he was always called either name, both Jacob and Israel. When Abram got another name, he was never called anything but Abraham; when Jacob got another name, he was called Jacob and Israel. The name Abraham was to receive its explanation in this world, because it was here that he became the father of many nations, from which his name is derived. The name Israel, on the other hand, belongs to the next world, where we will see God. So the people of God, the Christian people, is in this world and this time both Jacob and Israel; Jacob in our actual situation, Israel in our hopeful expectation.

Sermon 122.4

And you will be the father of many nations, and your name will no longer be called Abram, but you will be called Abraham, because I have made you the father of many nations. Because blessed Abraham left his kin and his father's house at the command of the Lord, he received deservedly also in this gift of reward to exist as the father of many nations; indeed of so many, that not only those who came from his seed according to the flesh, but also those who deriving their origin of flesh elsewhere, would follow the footsteps of his faith and obedience, as the Apostle writes to the Romans with full exposition. It should be known that Abram means Exalted Father, but Abraham means Father of Many, so it is understood, of many nations.

Commentary on Genesis (Hexaemeron)

Hence, the Stoic philosophers drew their doctrine as if from a source, saying that all things belong to the wise. For the East and the West, the North and the South are parts of the universe. The whole world is enclosed in them. When God promised Abraham that He would give him these things, what else does He declare but that He will provide everything to the wise and faithful, leaving nothing lacking? Thus, Solomon also says in Proverbs: the whole world of riches belongs to the faithful. How much greater is Solomon than Zeno, the master and founder of the Stoic sect! How much greater than Plato, the father of philosophy, or Pythagoras, the inventor of his name! But who is faithful, if not wise? For the fool is like the moon, always changing, but the wise person remains steadfast in their faith.

On Abraham

And I will establish my covenant between me and you, and between your seed after you in their generations with an everlasting covenant; that I may be your God and the God of your seed after you. The old translation has: And I will establish my testament. It should be noted, however, that wherever we read "testament" in Greek, in the Hebrew language it is "covenant" or "pact," that is, "berith." It is not surprising, then, that the testament or covenant of God is with Abraham and his seed in an everlasting covenant, that He may be their God: because indeed this covenant will be preserved throughout the entire duration of this life without any interruption in the generations of the chosen following in succession, and will be celebrated without any end in the future age. What follows, however, is:

Commentary on Genesis (Hexaemeron)

And I will give to you and to your seed after you the land of your sojournings, all the land of Canaan, for an everlasting possession. It requires a more laborious exposition on how it should be understood as fulfilled or still expected to be fulfilled, since any earthly possession cannot be eternal for any nation. But it should be known that "eternal" is interpreted by our people as what the Greeks call "Aeonion," which is derived from "age." For in Greek "Aeon" is called an age. But the Latins did not dare to say "age-long," lest they send the meaning far off into something else. For many things are called "age-long" that are done in this age in such a way as to pass away in a short time. However, what is called "Aeonion" either has no end or extends to the end of this age. And therefore, as we said above, the land of Canaan is given as an everlasting possession to the seed of Abraham, because in it Christians, up to the end of this age, whether from the Jews or from the Gentiles, that is, the seed of Abraham, are believed never to be lacking.

Commentary on Genesis (Hexaemeron)

9–11

God said again to Abraham: And you shall therefore keep my covenant, you and your offspring after you throughout their generations; this is my covenant which you shall keep between me and you and your offspring after you: Every male among you shall be circumcised; and you shall circumcise the flesh of your foreskin, and it shall be a sign of the covenant between me and you. The Lord, in His kind provision, first established the covenant of His grace with the blessed Abraham and his offspring; and then He requires of them the covenant of obedience: so that the labor of striving might be less terrifying when the reward of perpetual remuneration is heard first. Therefore, the foreskin of the flesh is commanded to be circumcised, as a sign of the covenant between God and men, so that by this sign the faithful of that time might be reminded to cleanse themselves from all pollution of flesh and spirit, perfecting holiness in the fear of God; but also by a higher mystery, that carnal circumcision was done as a sign of the covenant between God and Abraham's offspring, because it was given as a sign of that covenant of which it was said above to Abraham: In you all the families of the earth shall be blessed; which no faithful person doubts pertains to the grace of the new testament. Therefore, in the sign of this covenant, no faithful person doubts that Abraham and his offspring were circumcised in the flesh of their foreskin, so that it might be typologically prefigured that one would be born from his seed who would cleanse his chosen ones from all stain of sins, and grant them perpetual blessing; to the sacrament of which cleansing aptly corresponds what follows:

Commentary on Genesis (Hexaemeron)

We, therefore, instructed by the apostle Paul, say that just as many other things were made in the figure and image of future truth, so also that circumcision of flesh was bearing the form of spiritual circumcision about which it was both worthy and fitting that “the God of majesty” give commands to mortals. Hear, therefore, how Paul, “a teacher of the Gentiles in faith and truth,” teaches the church of Christ about the mystery of circumcision. “Behold,” he says, “the mutilation”—speaking about the Jews who are mutilated in the flesh—“for we,” he says, “are the circumcision, who serve God in spirit and have no confidence in the flesh.” This is one opinion of Paul about circumcision. Hear also another: “For he is not a Jew who is so outwardly; nor is that circumcision which is outwardly in the flesh. But he is a Jew who is one inwardly with circumcision of the heart in the spirit, not in the letter.” Does it not seem more appropriate to you to speak of such a circumcision among the saints and friends of God than to speak of a pruning of the flesh?But the novelty of the expression may perhaps deter not only the Jews but even some of our brothers. For Paul, who introduces “circumcision of the heart,” seems to assume things that are impossible. For how shall it be possible that a member be circumcised that, covered by the internal viscera, lies hidden even from the view of men?

Homilies on Genesis 3.4

I know that this part of the text is disturbing to many. Indeed, if circumcision is a good thing, it should be maintained today as well. If it is useless, it never should have been mandated in the first place, particularly not by divine precept. But, inasmuch as the apostle said, “Abraham received the sign of circumcision,” certainly the sign is not the reality itself but points to another reality. That is, it is not the truth but points to the truth. In fact, Paul expounds this teaching in the following terms: “He received the sign of circumcision as a seal of justice and of faith.” For this reason it is not inappropriate for us to understand that bodily circumcision is a sign of spiritual circumcision. Therefore the sign remained until the truth arrived. The Lord Jesus arrived, he who says, “I am the way and the truth and the life,” because he circumcises the whole person in truth, not a minor bodily member in sign. He abolished the sign; he installed the truth, because once that which was perfect arrived, that which was partial was abolished. Thus the circumcision of a part ceased when the circumcision of the whole shone forth. For it is now no longer man in part but the whole man who is saved in body, saved in soul. For it is written, “If any man would come after me, let him deny himself and take up his cross and follow me.” This is the perfect circumcision, because through the sacrifice of the body the soul is redeemed, of which the Lord himself says, “Whoever loses his life for my sake, he will save it.”

On Abraham

Abraham is ordered to circumcise himself when he is about to receive the inheritance of a true progeny. Is it not evident that “circumcision of the flesh” is the precept of chastity, that one should remove the passions of the flesh and curb the desires that unbridled lust renders indomitable? Indeed, the very word circumcision prescribes this, that every stench of impurity be wiped away and that the stimulus of the passions be removed.

On Abraham

In what sense is the covenant eternal? One interpretation is that it is eternal according to the One promising, for the things of God are not time conditioned. But relative to us eternal things become time conditioned. Another interpretation is that even when the covenant with Israel was abolished, it was maintained for us, and we are God’s [people] in place of them. Circumcision took over a second territory after the faith [came]. For just as the birth of the illegitimate child came first, after the promise of the legitimate one, because the birth of the latter was likewise belated, so now circumcision came first because the time for the spiritual [circumcision] was not yet; but when this new one appears, the other circumcision is thrown out. For “in Christ Jesus,” we say, “neither circumcision nor uncircumcision is of any avail.” That circumcision was a sign of the covenant, which could be present even in transgressors. But the true circumcision is the perfect observance of the law, the cutting away and removing of everything alien to God and the ability to pass beyond worldly things to approach the transcendent realities through understanding. Of this the eighth day of circumcision is the symbol. For the eighth day is supernatural, even as the Savior, by accomplishing the resurrection on the eighth day, showed the mystery. Likewise appropriate is the text’s reference to extermination, whether of those uncircumcised in the flesh or those whose heart has not been circumcised, the uncircumcised of heart, as one would say using Old Testament terminology.

Catena on Genesis 3.1026

And because he is called to what is perfect, Abraham receives the oracle that summons to perfection. “Circumcise,” it says, “every male of yours and circumcise your flesh”; but perfect circumcision is the spiritual one. Indeed, Scripture also teaches this when it says, “Circumcise the hardness of your heart.” Even here many interpret the text to be saying, “Circumcise every male of yours,” that is, your minds; for nothing is more virile than the mind. Moreover, because the male is also holy, it is said, “Every male opening the womb shall be called holy for the Lord.” But what is holier than the mind that produces the seeds of good thoughts by which it opens the womb of the soul, which was closed by the sterility that prevented it from childbearing, so that it might give birth to invisible generations, obviously through that spiritual womb of which Isaiah said, “We have conceived in the womb and given birth to the spirit of salvation”? So what is mandated is the intelligible circumcision of the heart as well as the sensible circumcision of the flesh: the former in truth, the latter in sign. Circumcision then is twofold because it requires the mortification of the mind and the body. The Egyptians in fact circumcise their males in the fourteenth year, and it is said that their women too are circumcised in the same year, because in that year the passion of virility begins to flare up and the menstrual cycles of women commence. But the promulgator of the eternal law requires the mark of carnal circumcision only in males, because in the sexual relationship the man is more impetuous than the woman, and for this reason he wished to check his passionate impulse by the mark of circumcision. Or, because men regard their error as licit, so long as they avoid adultery, and are convinced that the practice of prostitution is in conformity to the natural law, while the truth is that neither men nor woman are permitted to have sexual relationships outside of marriage. But according to a deeper interpretation, the intention is to explain that if the mind has once been purified and circumcised, freed from illicit desires and thoughts, it binds the soul to its own chastity, and, having infused it with purity of the senses, makes it capable of generating good offspring.The law orders that the baby boy be circumcised on the eighth day: evidently a precept that harbors a mystery, because this is precisely the day of the resurrection. Indeed, the Lord Jesus rose from the dead on Sunday. For this reason, if the day of resurrection finds us circumcised and free from excesses and crimes, purified from every filth, cleansed from bodily vices, if you go forth from this day clean, you will rise clean.

On Abraham

A child of eight days shall be circumcised among you. For on the eighth day, that is, after the Sabbath, the Lord rose from the dead, in whose passion and resurrection we are baptized, absolved from the oldness of faults, as if we are renewed by spiritual circumcision; the Apostle explaining and saying: For as many of us as were baptized into Christ Jesus were baptized into His death, therefore we were buried with Him through baptism into death: so that just as Christ was raised from the dead by the glory of the Father, so we also should walk in newness of life (Rom. VI, 3). This number can most fittingly correspond to the time of our resurrection, when we shall be clothed universally with the immortality of the flesh, which we laid down through death, and we shall suffer nothing of sin nor of corruption in the flesh. For our resurrection is also not incongruously figured by the number of the eighth day; because after the six ages of this world and the seventh of rest, that is, the rest of souls, which is now celebrated in another life, the future one will be. Therefore infants were commanded to be circumcised on the eighth day as a sign of the divine covenant to indicate mystically that all the elect by the grace of God would be absolved from all iniquities in this number, cleansed from all corruption of the flesh, and also freed from the very death that they incurred through the guilt of the first transgression.

Commentary on Genesis (Hexaemeron)

Every male among your generations, whether born in the house or bought with money, and whoever is not of your seed, shall be circumcised. This signifies that the grace of regeneration and immortality pertains to all the faithful, whether they derive their origin from the stock of Abraham or from another source of the flesh.

Commentary on Genesis (Hexaemeron)

God’s covenant is “in the flesh” of the person who “does not fight on the terms of the flesh” and who “always carries about in his body the death of Jesus.”

Catena on Genesis 3.1027

And My covenant shall be in your flesh for an everlasting covenant. By which covenant it is surely signified that I will clothe your flesh and soul together with perpetual renewal and immortality.

Commentary on Genesis (Hexaemeron)

Nothing done unwittingly is declared punishable by the law, since the law makes allowance even for one who claims to have committed unintentional homicide. Why then is the eight-day-old infant who is uncircumcised menaced as though subject to the penalty of death? Some say that this is to be applied, by way of interpretation, to the parents. They, it is thought, should be punished as having made light of the precept of the law. But others think that by the use of hyperbole, the text expresses anger with respect to the infant child, as much as it appears to do, in order that the inevitable punishment might be brought upon those who have reached the use of reason and who have broken the law.

Questions on Genesis 3.52.1

Not without reason or by excessive reaction do many find this passage disturbing, in that the Lord should say, “Any uncircumcised male who is not circumcised in the flesh of his foreskin shall be cut off from his people; he has broken my covenant.” Indeed, it is not taken lightly that the negligence of the parents could bring punishment upon an eight-day-old infant, so much so that his soul would perish, while even in the case of homicide—committed, however, by one who had unintentionally killed a man—the law stipulated to what cities the perpetrator might flee to obtain impunity for the shedding of blood. How is it possible, then, that for the case of homicide the involuntary character of the killing is taken into consideration, while here no account is taken of infancy, in which there could have been no fault whatever, whether of negligence or of purpose—unless perhaps some might think that the parents receive an even graver punishment in the death of their son? But it is regarded as unjust when the crime of a wrongdoer is inflicted on an innocent party or when a person is included in the punishment of another when he is not responsible to the same degree. For this reason some think that the passage is saying that the parent is to be exterminated, that it is his soul that should perish, not that of the baby. But the case is not at all clear, even if this opinion seems to be supported by the comment “because he has violated my covenant.” This then seems to refer to one who is capable of understanding, not to the infant child. Others maintain that the Lord God is threatening the parents, even if silently, with still graver punishments, so that as adults they will have even greater fear when [they see that] not even children are spared.

On Abraham

See the Lord’s wisdom in knowing how inobservant future generations are likely to be, and so, as though putting a bit in their mouths, he gave them this sign of circumcision, curbing their unrestrained urges in case they should mingle with other peoples. You see, he was aware of their lustful tendencies in not practicing restraint, even though it had been drummed into them countless times to refrain from their irrational impulses. Consequently he gave them a perpetual reminder with this sign of circumcision, as though fastening them with a chain. He set limits and rules to prevent them overstepping the mark instead of staying within their own people and having no association with those other peoples but rather keeping the patriarch’s line uncontaminated. In this way even the fulfillment of the promises could be achieved for their benefit. It is like a man of self-control and good sense having a disobedient child; he puts limits and rules on him not to show his face outside the front door or to be seen by passersby. In fact, he oftentimes ties him up by the feet so as to succeed in this way in getting the better of his extreme indiscipline. Well, in just the same way the loving Lord also placed this sign of circumcision in their flesh, like shackles on their feet, so that with this reminder at home they might have no further need of instruction from others.

Homilies on Genesis 39.14

A male whose foreskin's flesh has not been circumcised, that soul will be cut off from his people: because he has broken my covenant. By this sentence, the greater mystery of the same circumcision is revealed, which is not only a sign of renewal to come in Christ but also an abolition of the transgression committed in Adam; for what baptism now accomplishes through faith in Christ, circumcision accomplished from that time on the eighth day, which was a designation of Christ's resurrection; except that the entrance to the kingdom of heaven was not yet open to those circumcised, before the Lord, rising from death, unlocked the door of that same kingdom to all the elect by ascending to the heavens. For this reason, they were circumcised on the eighth day specifically; to signify that they would not truly be cleansed from all stain of vice except through the effect of the Lord's resurrection. However, it may raise a question how it is said, that soul will be cut off from his people, because he has broken my covenant, when there is no fault of the infant, whose soul, he said, will perish, nor has he himself broken the covenant of God, but those older who did not care to circumcise him; unless because even infants, not according to their own life's property, but according to the common origin of the human race, all broke the covenant of God in that one in whom all sinned. Therefore, since circumcision was a sign of regeneration, and not without reason the infant, on account of original sin, by which the first covenant of God was shattered, would be destroyed by generation unless liberation freed him; thus these divine words must be understood as if it were said: Whoever has not been regenerated, that soul will be cut off from his people, because he has broken the covenant of God; since in Adam, even he sinned with all.

Commentary on Genesis (Hexaemeron)

(Verse 15) And God said to Abraham: You shall not call your wife Sarai, but her name shall be Sarah. Those who think that the first Sarah was written with one 'R' and then another 'R' was added to it are mistaken. And because 'R' is the hundredth number among the Greeks, they suspect many silly things about her name: when in fact, whatever way they want to understand the composite word, it should have a Hebrew, not Greek, origin, since the name itself is Hebrew. However, no one calling someone in another language takes the etymology of the word from the other language. Therefore, Sarai () was first called by Sin, Res, Iod: with Iod removed, that is, the I element, the letter He was added, which is read as A: and she was called Sara (). However, the reason for the change of name is that she was previously called 'my princess', the mother of the household of only one. For it follows: I will give you a son from her, and I will bless him, and he will be among the nations, and the kings of the peoples will come from him. And notably, not as we read in Greek: God said to Abraham. Your wife Sarai shall not be called by her name Sarai: in Hebrew it is said: you shall not call her name Sarai, that is, you shall not say to her, you are my princess: for she shall be the princess of all nations. Some suspect, mistakenly, that before she was called leprous, and afterwards princess: since leprosy is called Sarath in our language, which seems to have some similarity; but in Hebrew it is completely different. For it is written with Sade, and Res, and Ain, and Thau: which differs greatly from the previous three letters, that is, Sin, Res, and He, with which Sara is written, it is clear.

Hebrew Questions on Genesis

Verse 7. "And the overseer of the eunuchs imposed names upon them, calling Daniel Belteshazzar (Balthasar), and Hananiah Shadrach, and Mishael Meshach, and Azariah Abednego." It was not only the overseer or master of the eunuchs (as others have rendered it, the "chief-eunuch") who changed the names of saints, but also Pharaoh called Joseph in Egypt Somtonphanec (Genesis 41:45), for neither of them wished them to have Jewish names in the land of captivity. Wherefore the prophet says in the Psalm: "How shall we sing the Lord's song in a strange land?" (Psalm 137:4). Furthermore the Lord Himself changes names benignly, and on the basis of events imposes names of special significance, so as to call Abram Abraham (Genesis 17:5), and Sarai Sarah (Genesis 17:15). Also in the Gospel, the former Simon received the name of Peter (Mark 3:16), and the sons of Zebedee are called "sons of thunder" (Mark 3:17) - which is not boanerges, as most people suppose, but is more correctly read benereem.

St. Jerome, Commentary on Daniel, CHAPTER ONE

[God] said, “And you shall not call your wife Sarai but Sarah,” that is, “You shall not call her ‘my ruler’ but ‘ruler.’ ” [This change teaches] clearly that since she had become a companion and sharer of such great faith, he should call her [by a name that expressed what] he understood her to be: not exclusively the ruler of his own house but ruler absolutely, that is, the parent of all rightly believing women. Hence, when blessed Peter was urging believing women from the nations to the virtues of humility, chastity and modesty, he remembered our mother Sarah with due praise, saying, “Just as Sarah was obedient to Abraham, calling him lord, you are her daughters when you do rightly and do not fear any disturbance.”

Homilies on the Gospels 1.11

And the Lord said to Abraham: "You shall not call your wife Sarai, but Sarah, and I will bless her, and I will give you a son by her, whom I will bless, and he will become nations, and kings of peoples shall come from him. Here the promises about the calling of the gentiles in Isaac are more evident, that is, in the son of promise, which signifies grace, not nature, because a son is promised from an old man and a barren old woman. Although God also works in the natural course of procreation, where however the evident work of God is, with nature being corrupted and ceasing, grace is understood more evidently; and because this will happen not by generation, but by regeneration, therefore circumcision is now commanded. When a son was promised from Sarah, the names of the parents are also changed, everything resonates with newness, and the New Testament is foreshadowed in the Old. Sarai is interpreted as "My Princess," but Sarah as "Princess," and the reason for the change of the name is this: because she was previously called "My Princess," that is, the mother of one household only, but afterwards she is called "Princess" absolutely; for it follows:

Commentary on Genesis (Hexaemeron)

And I will give you a son by her, whom I will bless, and he will become nations, and kings of peoples shall come from him. And notably, not as we read in Greek: God said to Abraham, Your wife Sarai will no longer be called Sarai; in Hebrew it is, You will not call her name Sarai; that is, you will not call her My Princess: she is now to be the princess of all nations, wherefore the Apostle Peter, instructing the life of women, says: So once holy women also, who hoped in the Lord, adorned themselves, being subject to their own husbands, as Sarah obeyed Abraham, calling him lord, of whom you are daughters, doing good and not fearing any disturbance (1 Peter 3:5).

Commentary on Genesis (Hexaemeron)

Now Abraham was not guilty of any doubt by his laughter, for he showed his love toward Ishmael in what he said. He had clung to this hope for twenty-five years. Abraham had manifested his faith in every vision that had come to him. However great his contest with barrenness became, he manifested the victory of his faith. But when old age was added to the barrenness, he laughed in his heart. That his Lord would do these two things for him was a marvel to him.

Commentary on Genesis 14:2

One should consider the fact that Abraham was uncircumcised when God called him, and he was still uncircumcised when he was promised a legitimate son as heir. You are hereby invited to believe that he is not only the father of the Jews, as they claim, but the progenitor, through faith, of all believers. Sarah also, before the circumcision of her husband and by the addition of one letter to her name, receives the blessing of no small gift, so that she might have the primacy of virtue and of grace. God promises that from her nations and kings of peoples will come, so that in her might be established the type not of the synagogue but of the church. The fact that Abraham laughed when he had been promised a son through her was an expression not of unbelief but of joy. Indeed, he “fell on his face”—in worship, which means he believed. And he added, “Shall a child be born to a man who is a hundred years old? Shall Sarah, who is ninety years old, bear a child?” And he said, “O that Ishmael might live in thy sight!” He is not incredulous with regard to the promises, nor is he greedy in what he asks for in prayer. “I have no doubt that you will come through, granting a son to an old man of a hundred years and that, as the author of nature, you will effectively stretch its limits. Blessed indeed is the one on whom this gift is bestowed; but I will be doubly favored if even this Ishmael here, whom I begot from the household slave, should live in your presence.” And so the Lord approved Abraham’s sentiments, did not deny his request and confirmed his own promises.

On Abraham

(Verse 17.) And Abraham fell upon his face and laughed. And he said in his heart, Shall a child be born unto him that is an hundred years old? and shall Sarah, that is ninety years old, bear? And after a little while: And thou shalt call his name Isaac. Different opinions, but there is one etymology why he is called Isaac. For Isaac is interpreted as laughter. Others say that Sarah laughed, therefore he was called laughter, which is false. Others indeed say that Abraham laughed, which we also approve. After Ishmael was born, Isaac was born, and then we read about Abraham and Sarah laughing. However, it should be known that in the Old Testament, four people were called by their names before they were born, without any disguise: Ishmael, Isaac, Solomon, and Josiah. Read the Scriptures.

Hebrew Questions on Genesis

He was not laughing because he did not believe, as some might imagine, but rejoicing because he did. “He laughed” is sometimes put in place of “he rejoiced,” as it is also in the Gospels. And for this reason, he also “fell on his face” and marveled in his heart.

Catena on Genesis 3.1038

Abraham fell on his face, and laughed, saying in his heart: "Shall a child be born to a man who is a hundred years old, and will Sarah, who is ninety years old, bear a child?" The laughter of Abraham is the exultation of one rejoicing, not the mockery of one disbelieving: those words which he said in his heart are not those of one doubting, but of one admiring; as testified also by the Apostle who, speaking of him, said: "He did not waver at the promise of God through unbelief, but was strengthened in faith, giving glory to God, and being fully convinced that what He had promised He was also able to perform." (Romans 4:20).

Commentary on Genesis (Hexaemeron)

And the Lord said to Abraham: "Sarah your wife shall bear you a son, and you shall call his name Isaac." Isaac is interpreted as Laughter, and it is not to be doubted that he was so called because when his birth was announced, Abraham laughed in his heart. This laughter fittingly signifies the joy of the New Testament, in which the children of the promise, with the Lord dwelling within them, shall rejoice forever.

Commentary on Genesis (Hexaemeron)

For what follows: "And I will establish My covenant with him for an everlasting covenant, and with his seed after him," etc. He says his seed in those who, by imitating the faith of Abraham, merit to hear from the Lord: "Blessed are you who weep now, for you shall laugh" (Luke 6:21); to such as these the Apostle, joining himself, says: "Now we, brethren, as Isaac was, are children of promise" (Galatians 4:28). Specifically, however, the name Isaac, that is, laughter, which is born from the promise, fittingly applies to the Mediator between God and men, about whose birth an angel said to the shepherds: "Do not be afraid, for behold, I bring you good tidings of great joy which will be to all people" (Luke 2:10).

Commentary on Genesis (Hexaemeron)

Don’t think it was without purpose that Scripture indicated to us his age; instead, it was for you to learn from the just man’s obedience in meekly submitting to pain despite his extreme old age on account of God’s command, and not only he but also Ishmael and all the servants—that was the reason for giving the ages.

Homilies on Genesis 40.14

He was ninety-nine years old when he circumcised the flesh of his foreskin, and Ishmael his son had completed thirteen years at the time of his circumcision. Therefore, Abraham was a hundred years old, and Ishmael was thirteen years old when they were circumcised: so that, after a year, when Isaac was born, Abraham was a hundred years old, and Ishmael was fourteen, that is, twice seven, years old? Indeed, in a great mystery: because evidently Isaac held the figure of the New Testament, and Ishmael of the Old Testament. For Isaac, when he was born, his father was a hundred years old, to signify that the grace of the New Testament would bring the children of his promise to the inheritance of the heavenly kingdom. Indeed, the number one hundred, as has often been said, in the arithmetical count, passes from the left to the right, and our heavenly mother Jerusalem is rightly marked by the right hand; for those to whom it is permitted to enter it will stand on the right hand of the Judge in the last examination. In the birth of the same Isaac, Ishmael had completed two weeks of years; evidently because of the sacrament of the Sabbath, which was observed in the Old Testament; so that in the fifteenth year, as if in the sign of the resurrection, that is, of the true circumcision, Isaac would be born; where it would be typified because the passing legal observance given by Moses would be succeeded by grace and truth which came by Jesus Christ. Therefore, when Isaac, who prefigured the grace of the New Testament, was born, his elder brother Ishmael, who signified the Old Testament, had completed the number seven in his age; because the observance of the law, in which the Sabbath held the greatest place, was fit to be extended until the time of grace; but the same number seven is doubled concerning the perfection of the same sacrament; because the law of God desires us to be freed both from servile, that is, from evil works in the body, and from harmful thoughts in the mind. The number seven is doubled because the law commands rest for bodies to its followers in this life and promises rest for souls in the future life; when Isaac was born and the first year of his age began, Ishmael began his fifteenth year because, with the grace of the Gospel appearing, even the law itself, spiritually understood, was found to be full of heavenly sacraments and to have preached the glory of the resurrection; but when Isaac had grown up, at the command of Sarah, Ishmael with his mother was cast out, it should not be thought that the Old Testament is to be abolished by the succession of the New Testament; but rather that the carnal observance of the law, with those who carnally, even while the grace of the Gospel shines, contend that it should be observed, ought to be expelled from the boundaries of the Church; but itself, understood in a spiritual sense, will lose neither a jot nor a tittle until all things are accomplished.

Commentary on Genesis (Hexaemeron)

Even the fact that Ishmael was circumcised in his thirteenth year is for an obvious reason, because one who is beginning to be sexually active should trim the ardor of his passion, so as to abstain from illicit unions and limit himself to a legitimate union only.

On Abraham

Learn fully then, children of love, concerning all things, for Abraham, who first circumcised, did so looking forward in the spirit to Jesus and had received the doctrines of the three letters. For it says, “Abraham circumcised from his household eighteen men and three hundred.” What then was the knowledge that was given to him? Notice that he first mentions the eighteen, and after a pause the three hundred. The eighteen is I (= 10) and H (= 8)—you have Jesus—and because the cross was destined to have grace in the T he says “and three hundred.” So he indicates Jesus in the two letters and the cross in the other. He knows this who placed the gift of his teaching in our hearts.

Epistle of Barnabas 9.7-9

Consider, on the other hand, I ask you, dearly beloved, God’s loving kindness and his unspeakable kindness to us. In that case pain and distress resulted from the action and no benefit came from circumcision, except simply making people recognizable through this sign and separating them from the other peoples. Our circumcision, on the contrary—I mean the grace of baptism—involves a painless medicine and is the means of countless good things for us, filling us with the grace of the Spirit. It has no limited span as in that other case, but rather in early years, in middle age and in the very height of old age can a person receive this circumcision—not the work of human hands—which involves not simply endurance but laying aside sin’s burden and finding pardon for the faults of all time.… The loving God saw the extraordinary degree of our limitations and the fact that we are suffering from incurable diseases and need a lot of care as well as his ineffable love. [Thus] he is in his provision for our salvation granted us the renewal that comes from the bath of rebirth, so that by setting aside the former person—that is, evil deeds—and putting on the new we may advance along the way of virtue.

Homilies on Genesis 40.16