Galatians 2:2-5

I went up according to a revelation and presented to them the gospel I preach among the Gentiles, but privately to those recognized as leaders. I wanted to be sure I was not running, and had not been running, in vain. But not even Titus, who was with me, was compelled to be circumcised, even though he was a Greek. This matter arose because some false brothers had infiltrated our ranks to spy on the freedom we have in Christ Jesus in order to enslave us. But we did not give up and submit to these people for even a moment, so that the truth of the gospel would be preserved for you.