Thematic Bible: Necessity of, denied by paul

But even Titus, who was with me, was not compelled to be circumcised, though he was a Greek. But it was because of the false brethren secretly brought in, who had slipped in to spy out our freedom which we have in Christ Jesus, in order to bring us into bondage. We did not yield to them even for a moment, so that the truth of the gospel might remain with you.