Galatians 2:11; Galatians 2:14

11 But when Cephas came to Antioch, I opposed him to his face, because he stood condemned.

14 But when I saw that their conduct was not in step with the truth of the gospel, I said to Cephas before them all, "If you, though a Jew, live like a Gentile and not like a Jew, how can you force the Gentiles to live like Jews?"