But when Cephas came to Antioch, I withstood him to his face, because he was deserving to blame.
For before certain persons came from James, he used to eat with the Gentiles; but when they came, he began to withdraw and to separate himself, fearing the circumcised.
And the rest of the Jews dissembled along with him, so that Barnabas also was led away by them into that dissimulation.
But when I saw that they were not walking uprightly according to the truth of the gospel, I said to Cephas before them all: If thou, though a Jew, livest like the Gentiles, and not like the Jews, how is it that thou dost compel the Gentiles to live like the Jews?
Galatians 2:11-14
Paul Reproves Peter
