Galatians 2:5

to whom we gave place in the way of subjection, no, not for an hour; that the truth of the gospel might continue with you. [But the sequel showed that I did not run in vain, for my voice and my authority were recognized in that council in the matter of Titus; and though certain Jews, who were members of the church and yet not Christians at all, but had entered the church to further Jewish interests, and who were ever then present in the council as spies of the Jews to spy out our liberty which we have in Christ, that they might bring the church of Christ back into the bondage of the law--though these I say were present, demanding the circumcision of Titus, I did not yield to them at all, but saved the liberty of Titus, that the true liberty of the gospel might be preserved for you Gentiles. Paul after this circumcised Timothy, who was by birth entitled to circumcision. He did this because by so doing he would give Timothy larger influence in preaching to the Jews, and because the church at Jerusalem, having, after a full hearing, accepted one uncircumcised Christian, had once for all admitted that circumcision was not essential to Christianity. Had Paul yielded in the case of Titus, the precedent would have established the contrary rule.]