Galatians 1:8-12

But even if we, or an angel from heaven, should preach to you a gospel contrary to what we have preached to you, he is to be accursed!

As we have said before, even now I say again: if anyone is preaching to you a gospel contrary to what you received, he is to be accursed!

For am I now seeking the favor of people, or of God? Or am I striving to please people? If I were still trying to please people, I would not be a bond-servant of Christ. Paul Defends His Ministry

For I would have you know, brothers and sisters, that the gospel which was preached by me is not of human invention.

For I neither received it from man, nor was I taught it, but I received it through a revelation of Jesus Christ.