Galatians 1: 6 - 9

I wonder that you are so soon removed from him that called you into the grace of Christ, unto another gospel. Which is not another, only there are some that trouble you, and would pervert the gospel of Christ. But though we, or an angel from heaven, preach a gospel to you besides that which we have preached to you, let him be anathema. As we said before, so now I say again: If any one preach to you a gospel, besides that which you have received, let him be anathema.