Now I say that Jesus Christ was a minister of the circumcision for the truth of God, to confirm the promises made unto the fathers:
Read Chapter 15
Augustine of Hippo
AD 430
Paul said this so that the Gentiles would understand that the Lord Christ had been sent to the Jews and so they would not be proud. Since the Jews rejected what had been sent to them, it happened that the gospel was also preached to the Gentiles, as is most clearly written in the Acts of the apostles, when the apostles say to the Jews: “It was necessary that the Word of God should be spoken first to you. Since you … judge yourselves unworthy … behold, we turn to the Gentiles.” It also agrees with the Lord’s own testimony, when he said: “I was sent only to the lost sheep of the house of Israel” and: “It is not right for the children’s bread to be thrown to the dogs.” If the Gentiles think carefully, they will realize by their own faith, by which they now believe that to the pure all things are pure, that they should not offend those Jewish converts who, perhaps from weakness, dare not touch certain kinds of meat, fearing that it has been in contact with idols.
Christ Jesus was minister of the circumcision, who came both for the salvation of the Jews, and of the Gentiles, who preached and would have his gospel first preached to the Jews, for the truth of God to confirm the promises made to the fathers, that he, the Messias, should be sent for their salvation; but at the same time also for the salvation and conversion of the Gentiles, which he confirms by divers evident testimonies of the holy Scriptures. (Witham)
He calls our Saviour the minister of circumcision, that is, of the Jews, because he appeared amongst them, dwelt amongst them, and himself preached amongst them. This was a privilege which the Gentiles did no enjoy, having never seen, nor heard Jesus Christ, since he confined his preaching to the strayed sheep of the house of Israel; and this, to accomplish the promises made to their fathers. (Calmet)
When Paul says that “Christ became a servant to the circumcised” he means that by coming to fulfill the law, by being circumcised and born of the seed of Abraham, Christ undid the curse, held back God’s wrath and made those who were meant to obtain the promises fit to receive them. … It was because you had transgressed the law that Christ came to fulfill it, not so that you might then keep it but so that he might confirm to you the promises which were made to the fathers, which the law had caused to be suspended because you offended and were unworthy of the promise.