Galatians 1:8-10

But even if we, or an angel from heaven, should preach to you a gospel contrary to that which we [originally] preached to you, let him be condemned to destruction! As we have said before, so I now say again, if anyone is preaching to you a gospel different from that which you received [from us], let him be condemned to destruction! Am I now trying to win the favor and approval of men, or of God? Or am I seeking to please someone? If I were still trying to be popular with men, I would not be a bond-servant of Christ.