Thematic Bible: Who is not the servant of Christ

I am astonished that you are so quickly deserting him who called you by the grace of Christ and turning to a different gospel which is really not another gospel; but there are some who are disturbing you, and want to pervert the gospel of Christ. But even if we, or an angel from heaven, should preach to you a gospel contrary to what we preached to you, let him be accursed! read more.
As we have said before, so I say again now, if any one is preaching to you a gospel contrary to what you received, let him be accursed! Am I now seeking the favor of men, or of God? Or am I trying to please men? If I were still trying to please men, I would not be a servant of Christ.