John Chrysostom

Great effrontery this, of the Pharisees, that even after faith they set up the Law, and will not obey the Apostles. But see these, how mildly they speak, and not in the tone of authority: such words are amiable, and more apt to fix themselves in the mind. Observe, it is nowhere a display of words, but demonstration by facts, by the Spirit. And yet, though they have such proofs, they still speak gently. But even if they would needs bring over the Gentiles to their side, they learn that neither must the Apostles overlook it.

Homily on Acts 32 ↗

Theophylact of Ohrid

The believers not from among the Gentiles, but from among the Jews, demanded that those who accepted the faith be circumcised and observe the other commandments of the law that pertained to the fleshly nature of man. The other disciples disagreed with them, who reasoned on the basis of the ancient law, even though they themselves were also of the circumcision, because they endeavored to make a ruling not according to their own desire, but in consideration of the common good.

Commentary on Acts ↗

Bede

Saying that it is necessary to circumcise them. The Galatians were deceived by this error, believing that circumcision and the ceremonies of the law should be mixed with the grace of baptism.

Commentary on Acts ↗