Galatians 2:1-5

Then after fourteen years I went up again to Jerusalem with Barnabas, and also took Titus with me. And I went up by revelation, and communicated to them that gospel which I preach among the Gentiles, but privately to those who were of reputation, lest by any means I might run, or had run, in vain. Yet not even Titus who was with me, being a Greek, was compelled to be circumcised. And this occurred because of false brethren secretly brought in (who came in by stealth to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage), to whom we did not yield submission even for an hour, that the truth of the gospel might continue with you.