Galatians 2:12-14

12for before certain people came from Jacob, he regularly ate with the Gentiles; but when they came, he began to withdraw and separate himself, fearing those from the circumcision.

13And the rest of the Jews joined him in hypocrisy, so that even Barnabas was carried away with their hypocrisy.

14But when I saw that they were not walking in line with the truth of the Good News, I said to Peter in front of everyone, “If you—being a Jew—live like the Gentiles and not like the Jews, how can you force the Gentiles to live like Jews?”