And the other Jews joined likewise with him; so that Barnabas also was carried away with their hypocrisy.
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Augustine of Hippo
AD 430
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.
And the other Jews dissembled likewise with him. What was the nature of this dissimulation? Jerome, Chrysostom, and Å’cumenius say it was "economical," to prevent the Jews being scandalised; but Augustine, Anselm, and the Latins in general give a more satisfactory explanation in maintaining that it was an act of hypocrisy. The latter, too, have the Greek on their side, the literal meaning of which Isaiah , they acted hypocritically with him. They pretended to keep the law, which they knew to be abrogated. Barnabas followed them in pretending that there was a difference in meats, and that the Jews were to be preferred to the Gentiles, and Song of Solomon , though they did not consciously intend it, yet they made the Greeks to believe that the Old Law was necessary to salvation.
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. –.
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.