Jerome : (Vers. 29-31.) But as then he that was born according to the flesh persecuted him that was born according to the spirit, even so it is now. But what saith the scripture? Cast out the bondwoman and her son: for the son of the bondwoman shall not be heir with the son of the freewoman. So then, brethren, we are not children of the bondwoman, but of the free. In this liberty Christ hath made us free. I do not think it impossible to find where Ishmael persecuted Isaac; but only this, that when the son of the Egyptian, who was elder, played with Isaac, Sara was indignant, and said to Abraham: Cast out the bondwoman and her son: for the son of the bondwoman shall not be heir with my son Isaac. (Gen. XXI, 10). And certainly, a simple game among children is unworthy of expulsion and abandonment. But the Apostle, like a Hebrew among Hebrews, and instructed at the feet of the teacher Gamaliel, who once restrained the raging Pharisees against the Lord by council, understood from the words of Sarah saying: for the son of the maidservant will not inherit with my son Isaac, that that simple game was not. But because perhaps Ishmael, as the older one, and at that time already circumcised when he could understand and feel what he suffered, claimed for himself the right of the firstborn, the Scripture called the quarrel of the little ones a game. Unable to bear these words, Sarah, not enduring the custom of the firstborn claiming the rights of a slave woman's son from a young age, burst out in a voice: Cast out the slave woman and her son, for the son of the slave woman shall not inherit with my son Isaac. When this seemed harsh to Abraham (for greater things are always due to the firstborn), not only did Ishmael cease to be the firstborn, but he did not even receive an equal portion with his younger brother: God, who wanted the free woman to be inside and the slave woman to be expelled, confirms Sarah's words and speaks to Abraham: Let it not be harsh in your sight concerning the boy and the slave woman. Everything that Sara tells you, listen to her voice: for it is through Isaac that you will have descendants. Just as in the past, the older brother Ishmael persecuted the infant Isaac, claiming the privilege of circumcision and the rights of the firstborn; so now, according to the flesh, Israel (formerly Ishmael) rises up against the younger brother, the Christian people from the nations. Let us consider the foolishness of the Jews, who killed the Lord, persecuted the prophets and apostles, and opposed the will of God; and we will see much greater persecutions, as History also teaches us, stirred up by the Jews against the Christians than by the Gentiles. Do we marvel at the Jews? Even today, those who are born again in Christ and live spiritually are persecuted by those who still live in the flesh. And as they rise with Christ, they seek the things that are above, not the things that are below. Let them do what they want: let them persecute Isaac with Ishmael; let them cast out the bondwoman and her Egyptian mother. They will not inherit the promise, which only those who are born of the promise will obtain. And elegantly also, he who is born according to the flesh persecutes the spiritual. For the spiritual does not pursue the carnal; but forgives him as to a country brother: he knows that he can improve over time. And if at any time he sees the Egyptian son angry, he remembers the one father who created light, cattle, and mosquitoes: and in a great house, there are not only golden and silver vessels; but also wooden and earthen vessels. Therefore, let us say with the Apostle Paul: We are not slaves of the son, but free (2 Timothy 2); and being renewed in Christ, let us hear the words of the Lord speaking to the Jews: If you abide in my word, you will know the truth, and the truth will set you free (John 8:31, 32). The Apostle, liberated by this freedom, used to say: 'For although I am free from all, he who sins is a slave of sin' (I Cor. IX, 19). He, knowing himself free from all vices, from every desire and error, rightly rejoiced in the freedom of Christ saying: 'We are not slaves, but free: in this freedom Christ has set us free' (John VIII, 34). — Commentary on Galatians Jerome : Ishmael, the elder brother, persecuted him while still a nursing infant, claiming for himself the prior right of circumcision and the inheritance of the firstborn.… And it is aptly said that he who is born according to nature persecutes the spiritual. The spiritual one never persecutes the natural one but forgives him like an untutored brother, for he knows that he may progress. — EPISTLE TO THE Galatians 2.4.29-31 John Chrysostom : What! does all this consolation consist in showing that freemen are persecuted by bond-men? By no means, he says, I do not stop here, listen to what follows, and then, if you be not pusillanimous under persecution, you will be sufficiently comforted. And what is it that follows? "Cast out the son of the handmaid, for he shall not inherit with the son of the freewoman." Behold the reward of tyranny for a season, and of recklessness out of season! the son is cast out of his father's house, and becomes, together with his mother, an exile and a wanderer. And consider too the wisdom of the remark; for he says not that he was cast forth merely because he persecuted, but that he should not be heir. For this punishment was not exacted from him on account of his temporary persecution, (for that would have been of little moment, and nothing to the point,) but he was not suffered to participate in the inheritance provided for the son. And this proves that, putting the persecution aside, this very thing had been typified from the beginning, and did not originate in the persecution, but in the purpose of God. Nor does he say, "the son of Abraham shall not be heir," but, "the son of the handmaid," distinguishing him by his inferior descent. Now Sarah was barren, and so is the Gentile Church; observe how the type is preserved in every particular, as the former, through all the by-gone years, conceived not, and in extreme old age became a mother, so the latter, when the fulness of time is come, brings forth. And this the prophets have proclaimed, saying, "Rejoice, thou barren that bearest not; break forth and cry, thou that travailest not; for more are the children of the desolate than of her which hath the husband." And hereby they intend the Church; for she knew not God, but as soon as she knew Him, she surpassed the fruitful synagogue. — Homily on Galatians 4 Oecumenius : — [THEODORET] Let this not trouble us either, that those entrusted are driven out by the unbelievers. For we find something of this kind also in the type, but it in no way prevailed against Isaac. [end of the excerpt by Theodoret] — "Yet as at that time." And from that very fact that the faithful were persecuted by the Jews (for they were then persecuted), he shows the pattern to be true. For even Ishmael, who was born according to the flesh, persecuted Isaac, who was born according to the Spirit and the promise. ... — Commentary on Galatians