Thematic Bible: Necessity of, denied by paul

But they did not even require that Titus, a Greek [i.e., a Gentile] who was with me, become circumcised. For [certain] false brothers, who were secretly brought in to observe us practicing our liberty in Christ Jesus [i.e., by not having Titus circumcised], attempted to place us [back] under the bondage [of Mosaic law keeping]. But we did not submit ourselves to their influence for even an hour, so that you people might be able to continue [following] the truth of the Gospel.