Galatians 2:3
But not even Titus, who was with me, though he was a Greek, was compelled to be circumcised;
Acts 16:3
Him Paul wished to go forth with him, and took and circumcised him on account of the Jews who were in those places; for they all knew that his father was a Greek.
Acts 15:24
Whereas we have heard, that some who went out from us have troubled you with words, subverting your souls, to whom we gave no command;
1 Corinthians 9:20-21
and to the Jews I became as a Jew, that I might gain Jews; to those under the Law, as under the Law, not being myself under the Law, that I might gain those under the Law;
2 Corinthians 2:13
I had no rest in my spirit, because I found not Titus my brother; but taking my leave of them, I went forth into Macedonia.
Galatians 5:2-6
Behold, I Paul say to you, that if ye are circumcised, Christ will profit you nothing;