Thematic Bible: Necessity of, denied by paul

But even Titus, who was with me, was not forced to be circumcised, though he was a Greek. Yet because of false brothers secretly brought in--who slipped in to spy out our freedom that we have in Christ Jesus, so that they might bring us into slavery-- to them we did not yield in submission even for a moment, so that the truth of the gospel might be preserved for you.