Galatians 1:6-9
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6I marvel that you are so quickly deserting him who called you in the grace of Christ to a different gospel; 7and there isn`t another gospel. Only there are some who trouble you, and want to pervert the gospel of Christ. 8But even though we, or an angel from heaven, should preach to you any gospel other than that which we preached to you, let him be cursed. 9As we have said before, so I now say again: if any man preaches to you any gospel other than that which you received, let him be cursed.
Galatians 1:6-9 (WEB)