Galatians 2:1-3

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.