Thematic Bible: Those that preach other gospels

I marvel that ye are so soon turning from him that called you in the grace of Christ, to a different gospel; which is not another; only there are certain persons who are troubling you, and seeking to change entirely the gospel of Christ. But even if we or an angel from heaven should preach a gospel to you contrary to that which we preached to you, let him be accursed! read more.
As we have said before, so I now say again, If any one preach a gospel to you contrary to that which ye received, let him be accursed! For do I now seek the favor of men, or of God? Or am I endeavoring to please men? If I were still pleasing men, I should not be the servant of Christ.