Galatians 1:8

1:8 But even if we (or an angel from heaven) should preach a gospel contrary to the one we preached to you, let him be condemned to hell!

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 2:13

2:13 And the rest of the Jews also joined with him in this hypocrisy, so that even Barnabas was led astray with them by their hypocrisy.