Galatians 2:11-16

But when Cephas (Peter) came to Antioch, I protested and opposed him to his face [concerning his conduct there], for he was blameable and stood condemned. For up to the time that certain persons came from James, he ate his meals with the Gentile [converts]; but when the men [from Jerusalem] arrived, he withdrew and held himself aloof from the Gentiles and [ate] separately for fear of those of the circumcision [party]. And the rest of the Jews along with him also concealed their true convictions and acted insincerely, with the result that even Barnabas was carried away by their hypocrisy (their example of insincerity and pretense). But as soon as I saw that they were not straightforward and were not living up to the truth of the Gospel, I said to Cephas (Peter) before everybody present, If you, though born a Jew, can live [as you have been living] like a Gentile and not like a Jew, how do you dare now to urge and practically force the Gentiles to [comply with the ritual of Judaism and] live like Jews? [I went on to say] Although we ourselves (you and I) are Jews by birth and not Gentile (heathen) sinners, Yet we know that a man is justified or reckoned righteous and in right standing with God not by works of the Law, but [only] through faith and [absolute] reliance on and adherence to and trust in Jesus Christ (the Messiah, the Anointed One). [Therefore] even we [ourselves] have believed on Christ Jesus, in order to be justified by faith in Christ and not by works of the Law [for we cannot be justified by any observance of the ritual of the Law given by Moses], because by keeping legal rituals and by works no human being can ever be justified (declared righteous and put in right standing with God). [Ps. 143:2.]