{2} For before that certain came from James, he did eat with the Gentiles: but when they were come, he withdrew and separated himself, fearing them which were of the circumcision.

(2) Another most vehement proof of his apostleship, and also of that doctrine which he had delivered concerning free justification by faith alone. And it was for this doctrine alone that he reprehended Peter at Antioch, who offended in this, in that for the sake of a few Jews who came from Jerusalem, he played the Jew, and offended the Gentiles who had believed.

People's New Testament

2:12 Before that certain came from James. Men sent from Jerusalem by James, who stood now at the head of that church.

He used to eat with the Gentiles. See Ac 11:3. Peter had no scruples about eating with Gentile Christians; but many of the Jewish Christians did. Hence he did before the messengers came from James what he refused to do after they came, separating himself from the Gentile Christians at Antioch.

Jamieson-Fausset-Brown Bible Commentary

12. certain-men: perhaps James' view (in which he was not infallible, any more than Peter) was that the Jewish converts were still to observe Jewish ordinances, from which he had decided with the council the Gentiles should be free (Ac 15:19). Neander, however, may be right in thinking these self-styled delegates from James were not really from him. Ac 15:24 favors this. "Certain from James," may mean merely that they came from the Church at Jerusalem under James' bishopric. Still James' leanings were to legalism, and this gave him his influence with the Jewish party (Ac 21:18-26).

eat with . Gentiles-as in Ac 10:10-20, 48, according to the command of the vision (Ac 11:3-17). Yet after all, this same Peter, through fear of man (Pr 29:25), was faithless to his own so distinctly avowed principles (Ac 15:7-11). We recognize the same old nature in him as led him, after faithfully witnessing for Christ, yet for a brief space, to deny Him. "Ever the first to recognize, and the first to draw back from great truths" [Alford]. An undesigned coincidence between the Gospels and the Epistle in the consistency of character as portrayed in both. It is beautiful to see how earthly misunderstandings of Christians are lost in Christ. For in 2Pe 3:15, Peter praises the very Epistles of Paul which he knew contained his own condemnation. Though apart from one another and differing in characteristics, the two apostles were one in Christ.

withdrew-Greek, "began to withdraw," &c. This implies a gradual drawing back; "separated," entire severance.

Matthew Henry's Concise Commentary

2:11-14 Notwithstanding Peter's character, yet, when Paul saw him acting so as to hurt the truth of the gospel and the peace of the church, he was not afraid to reprove him. When he saw that Peter and the others did not live up to that principle which the gospel taught, and which they professed, namely, That by the death of Christ the partition wall between Jew and Gentile was taken down, and the observance of the law of Moses was no longer in force; as Peter's offence was public, he publicly reproved him. There is a very great difference between the prudence of St. Paul, who bore with, and used for a time, the ceremonies of the law as not sinful, and the timid conduct of St. Peter, who, by withdrawing from the Gentiles, led others to think that these ceremonies were necessary.