Galatians 2:1-4

Then after the space of fourteen years I went up again to Jerusalem with Barnabas, taking Titus also with me. And I went up by revelation; and I laid before them the gospel which I preach among the Gentiles but privately before them who were of repute, lest by any means I should be running, or had run, in vain. But not even Titus who was with me, being a Greek, was compelled to be circumcised: and that because of the false brethren privily brought in, who came in privily to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage