John Chrysostom
After this, “those of the circumcision contended,” not the apostles. What does “contended” mean? The writer says that they were greatly scandalized. See what they object to. They do not say, “Why did you preach to them?” but, “Why did you eat food with them?” Peter does not dwell on this cold remark, and truly it was cold. Instead, pointing to the great matter, he says: if they too received the Spirit, how could baptism not be given to them? Why did this not happen with the Samaritans, but the opposite? Not only did it not happen before baptism, but not even after baptism. And the believers from the Jews were not indignant at them. Rather, when they heard, they sent Peter and John for this very purpose (Acts 8:14-15).
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Yet here also they do not rebuke him for this, since they knew that it was the work of God’s grace. Instead they say, “Why did you eat food with them?” On the other hand, there is a great and incomparable difference between Samaritans and Gentiles. Or perhaps he was subjected to rebuke according to God’s good ordering, so that they might learn. For Peter would not have spoken without necessity. See how he is neither proud nor vainglorious. Do you see how unfriendly their reception of him was? Do you see what zeal they had for the law? They were not ashamed by Peter’s dignity, nor by the signs that had occurred, nor by the great event that the Gospel word had been received by the Gentiles. Instead, they “contended” about these minor matters. If nothing of this sort had taken place, the event itself would not have been enough for them.