John Chrysostom
After this, "those of the circumcision reproached him," and not the apostles. What does "reproached" mean? The writer says that they were greatly scandalized. And see what objection they raise. 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, then, did this not happen with the Samaritans, but the opposite? Not only did it not happen before baptism, but not even after baptism. Yet the believers from among the Jews were not indignant with them. When they heard, they sent Peter and John for this very purpose (Acts 8:14-15).
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Here too, however, they do not reproach him for this, since they knew 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 reproach by God's ordering, so that they might be taught, since Peter would not have spoken without need. See how free he is from pride and vainglory. Do you see how unfriendly their reception of him was? Do you see what zeal they had for the law? They were ashamed neither before Peter's dignity, nor before the signs that had taken place. Nor were they ashamed before the great event, that the gospel word had been received by the Gentiles. Instead, they "reproached" him about insignificant matters. If there had been nothing of this kind, the event itself would not have been enough for them.