For before that certain persons came. The state of the case is here laid down. For the sake of the Jews, Peter had withdrawn himself from the Gentiles, in order to drive them from the communion of the Church, unless they would relinquish the liberty of the Gospel, and submit to the yoke of the Law. If Paul had been silent here, his whole doctrine fell; all the edification obtained by his ministry was ruined. It was therefore necessary that he should rise manfully, and fight with courage. This shews us how cautiously we ought to guard against giving way to the opinions of men, lest an immoderate desire to please, or an undue dread of giving offense, should turn us aside from the right path. If this might happen to Peter, how much more easily may it happen to us, if we are not duly careful!

For before that certain came - Some of the Jews who had been converted to Christianity. They evidently observed in the strictest manner the rites of the Jewish religion.
Came from James - See the note at Galatians 1:19. Whether they were sent by James, or whether they came of their own accord, is unknown. It is evident only that they had been intimate with James at Jerusalem, and they doubtless pleaded his authority. James had nothing to do with the course which they pursued; but the sense of the whole passage is, that James was a leading man at Jerusalem, and that the rites of Moses were observed there. When they came down to Antioch, they of course observed those rites, and insisted that others should do it also. It is very evident that at Jerusalem the special rites of the Jews were observed for a long time by those who became Christian converts. They would not at once cease to observe them, and thus needlessly shock the prejudices of their countrymen; see the notes at Acts 21:21-25.
He did eat with the Gentiles - Peter had been taught that in the remarkable vision which he saw as recorded in Acts 10. He had learned that God designed to break down the wall of partition between the Jews and the Gentiles, and he familiarly associated with them, and partook with them of their food. He evidently disregarded the special laws of the Jews about meats and drinks, and partook of the common food which was in use among the Gentiles. Thus he showed his belief that all the race was henceforward to be regarded as on a level, and that the special institutions of the Jews were not to be considered as binding, or to be imposed on others.
But when they were come, he withdrew and separated himself - He withdrew from the Gentiles, and probably from the Gentile converts to Christianity. The reason why he did this is stated. He feared those who were of the circumcision, or who had been Jews. Whether they demanded this of him; whether they encountered him in debate; or whether he silently separated himself from the Gentiles without their having said anything to him, is unknown. But he feared the effect of their opposition; he feared their reproaches; he feared the report which would be made to those at Jerusalem; and perhaps he apprehended that a tumult would be excited and a persecution commenced at Antioch by the Jews who resided there. This is a melancholy illustration of Peter's characteristic trait of mind. We see in this act the same Peter who trembled when he began to sink in the waves; the same Peter who denied his Lord. Bold, ardent, zealous, and forward; he was at the same time timid and often irresolute; and he often had occasion for the deepest humility, and the most poignant regrets at the errors of his course. No one can read his history without loving his ardent and sincere attachment to his Master; and yet no one can read it without a tear of regret that he was left thus to do injury to his cause. No man loved the Saviour more sincerely than he did, yet his constitutional timidity and irresolutehess of character often led him to courses of life suited deeply to wound his cause.

Before that certain came from James, he did eat with the Gentiles - Here was Peter's fault. He was convinced that God had pulled down the middle wall of partition that had so long separated the Jews and Gentiles, and he acted on this conviction, associating with the latter and eating with them; but when certain Jews came from James, who it appears considered the law still to be in force, lest he should place a stumbling-block before them he withdrew from all commerce with the converted Gentiles, and acted as if he himself believed the law to be still in force, and that the distinction between the Jews and the Gentiles should still be kept up.

(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.

For before that certain came from James,.... The Lord's brother, mentioned before with Cephas and John, who resided at Jerusalem, from whence these persons came; and who are said to come from James, because they came from the place and church where he was, though, it may be, not sent by him, nor with his knowledge. They were such as professed faith in Christ; they were "judaizing" Christians believing in Christ, but were zealous of the law. Now before the coming of these persons to Antioch,
he, Peter,
did eat with the Gentiles; which is to be understood, not of eating at the Lord's table with them, but at their own tables: he knew that the distinction of meats was now laid aside, and that nothing was common and unclean of itself, and that every creature of God was good, and not to be refused if received with thankfulness; wherefore he made use of his Christian liberty, and ate such food dressed in such manner as the Gentiles did, without any regard to the laws and ceremonies of the Jews; and in this he did well, for hereby he declared his sense of things, that the ceremonial law was abolished, that not only the Gentiles are not obliged to it, but even the Jews were freed from it, and that the observance of it was far from being necessary to salvation: all which agreed with the preaching and practice of the Apostle Paul, and served greatly to confirm the same, and for this he was to be commended: nor is this mentioned by way of blame, but for the sake of what follows, which was blameworthy:
but when they were come he withdrew and separated himself; not from the church, and the communion of it, for then he had been guilty of schism, but from private conversation with the Gentiles: he did not visit them in their own houses, and sit down at table and eat with them, as he was wont to do; which argued great inconstancy and instability, very unbecoming one that seemed to be, and was a pillar in the church of God, as well as much dissimulation, for he knew better than he acted; his conduct did not agree with the true sentiments of his mind, which he covered and dissembled; and which must be very staggering to the believing Gentiles, to see so great a man behave in such a manner towards them, as if they were persons not fit to converse with, and as if the observance of Jewish rites and ceremonies was necessary to salvation. What induced him to take such a step was, his
fearing them which were of the circumcision: that is, the circumcised Jews, who professed faith in Christ, and were just now come from Jerusalem; not that he feared any danger from them; that they would abuse his person, or take away his life; but he might either fear he should come under their censure and reproofs, as he formerly had for going to Cornelius, and eating with him and his; or lest that they should be offended with him, and carry back an ill report of him, as not acting up to his character as an apostle of the circumcision. This led him into such a conduct; so true is that of the wise man, that "the fear of man bringeth a snare", Proverbs 29:25.

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 (Acts 15:19). NEANDER, however, may be right in thinking these self-styled delegates from James were not really from him. Acts 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 (Acts 21:18-26).
eat with . . . Gentiles--as in Acts 10:10-20, Acts 10:48, according to the command of the vision (Acts 11:3-17). Yet after all, this same Peter, through fear of man (Proverbs 29:25), was faithless to his own so distinctly avowed principles (Acts 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 2-Peter 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.