Gal 2:11-13

Paul Rebukes Peter at Antioch 11But when Cephas came to Antioch, I opposed him to his face, because he stood self-condemned;12for until certain people came from James, he used to eat with the Gentiles. But after they came, he drew back and kept himself separate for fear of the circumcision faction.13And the other Jews joined him in this hypocrisy, so that even Barnabas was led astray by their hypocrisy.