King James Version
But when I saw that they walked not uprightly according to the truth of the gospel, I said unto Peter before them all, If thou, being a Jew, livest after the manner of Gentiles, and not as do the Jews, why compellest thou the Gentiles to live as do the Jews?English Standard Version
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?"Catholic Public Domain Version
But when I had seen that they were not walking correctly, by the truth of the Gospel, I said to Cephas in front of everyone: "If you, while you are a Jew, are living like the Gentiles and not the Jews, how is it that you compel the Gentiles to keep the customs of the Jews?