Galatians 1:12

1:12 For I did not receive it or learn it from any human source; instead I received it by a revelation of Jesus Christ.

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 3:11

3:11 Now it is clear no one is justified before God by the law, because the righteous one will live by faith.