Galatians 1:8-9

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! 1:9 As we have said before, and now I say again, if any one is preaching to you a gospel contrary to what you received, let him be condemned to hell!

Galatians 1:11

Paul’s Vindication of His Apostleship

1:11 Now I want you to know, brothers and sisters, that the gospel I preached is not of human origin.

Galatians 1:16

1:16 to reveal his Son in me so that I could preach him among the Gentiles, I did not go to ask advice from any human being,

Galatians 1:23

1:23 They were only hearing, “The one who once persecuted us is now proclaiming the good news of the faith he once tried to destroy.”