Thematic Bible: Necessity of, denied by paul

But not even Titus who was with me, though he was a Greek, was compelled to be circumcised. [This issue arose] because of false brothers smuggled in, who came in secretly to spy on our freedom that we have in Christ Jesus, in order to enslave us. But we did not yield in submission to these people for even an hour, so that the truth of the gospel would remain for you.