Galatians 2:3-5 RSV

3 But even Titus, who was with me, was not compelled to be circumcised, though he was a Greek.
4 But because of false brethren secretly brought in, who slipped in to spy out our freedom which we have in Christ Jesus, that they might bring us into bondage--
5 to them we did not yield submission even for a moment, that the truth of the gospel might be preserved for you.