Galatians 2:1-4

Then after fourteen years I went up again to Jerusalem with Barnabas, taking Titus along with me. I went up because of a revelation and set before them (though privately before those who seemed influential) the gospel that I proclaim among the Gentiles, in order to make sure I was not running or had not run in vain. But even Titus, who was with me, was not forced to be circumcised, though he was a Greek. Yet because of false brothers secretly brought in—who slipped in to spy out our freedom that we have in Christ Jesus, so that they might bring us into slavery