Galatians 2:5

2:5 But we did not surrender to them even for a moment, in order that the truth of the gospel would remain with you.

Galatians 2:1

Confirmation from the Jerusalem Apostles

2:1 Then after fourteen years I went up to Jerusalem again with Barnabas, taking Titus along too.

Galatians 1:7

1:7 not that there really is another gospel, but there are some who are disturbing you and wanting to distort the gospel of Christ.