Galatians 2:13-14

13The other Jews joined him in his hypocrisy, so that by their hypocrisy even Barnabas was led astray.

14When I saw that they were not acting in line with the truth of the gospel, I said to Cephas in front of them all, “You are a Jew, yet you live like a Gentile and not like a Jew. How is it, then, that you force Gentiles to follow Jewish customs?