Augustine of Hippo : Paul never fell into any pretense, for he everywhere observed a principle which seemed fitting both to Gentile and to Jewish churches, that he should nowhere take away a custom whose observation did not prevent the receiving of God's kingdom.… Peter, however, when he came to Antioch, was rebuked by Paul not because he observed the Jewish custom in which he was born and reared, although he did not observe it among the Gentiles, but because he wanted to impose it on the Gentiles. This happened after seeing certain persons come from James—that is, from Judea, since James was the head of the church in Jerusalem. It was therefore in fear of those who still thought that salvation resided in these observances that Peter separated himself from the Gentiles and pretended to consent in imposing those burdens of servitude on the Gentiles. — EPISTLE TO THE Galatians 15 [1B.2.11-16] Gaius Marius Victorinus : What then should we understand by "their insincerity"? Even Peter and Barnabas and the other Jews had not truly gone to the length of living their lives according to Jewish practice. They even pretended to do so as an ad hoc measure, because of the fears of those around them. And therefore, he says, even Barnabas acquiesced in their insincerity. — EPISTLE TO THE Galatians 1.2.12-13 John Chrysostom : "Insomuch that even Barnabas was carried away with their dissimulation." Be not surprised at his giving this proceeding the name of dissimulation, for he is unwilling, as I said before, to disclose the true state of the case, in order to the correction of his disciples. On account of their vehement attachment to the Law, he calls the present proceeding "dissimulation," and severely rebukes it, in order effectually to eradicate their prejudice. And Peter too, hearing this joins in the feint, as if he had erred, that they might be corrected by means of the rebuke administered to him. Had Paul reproved these Jews, they would have spurned at it with indignation, for they held him in slight esteem; but now, when they saw their Teacher silent under rebuke, they were unable to despise or resist Paul's sentence. — Homily on Galatians 2 John Damascene : By hypocrisy he means the observation of the Law, and he teaches that they should be separated from it. Oecumenius : "joined him in his pretense." He calls the thing itself a pretense, so that the hidden arrangement would no longer benefit those who believed because of circumcision. "and the other Jews." For there were also other believers from the circumcision in Antioch, who themselves, he says, separated themselves from those of uncircumcision because of those who had come from James. — Commentary on Galatians Tertullian : Well, but Marcion, finding the Epistle of Paul to the Galatians (wherein he rebukes even apostles ) for "not walking uprightly according to the truth of the gospel," as well as accuses certain false apostles of perverting the gospel of Christ), labours very hard to destroy the character of those Gospels which are published as genuine and under the name of apostles, in order, forsooth, to secure for his own Gospel the credit which he takes away from them. — Against Marcion Book IV