Thematic Bible: Necessity of, denied by paul

But not even Titus [who was] with me, [although] he was a Greek, was compelled to be circumcised. Now [this was] because of the false brothers secretly brought in, who slipped in to spy out our freedom that we have in Christ Jesus, in order that they might enslave us, to whom not even for an hour did we yield in subjection, in order that the truth of the gospel might remain continually with you.