Galatians 1:6-9 New Revised Standard Version (NRSV)
There Is No Other Gospel
6 I am astonished that you are so quickly deserting the one who called you in the grace of Christ and are turning to a different gospel— 7 not that there is another gospel, but there are some who are confusing you and want to pervert the gospel of Christ. 8 But even if we or an angel[a] from heaven should proclaim to you a gospel contrary to what we proclaimed to you, let that one be accursed! 9 As we have said before, so now I repeat, if anyone proclaims to you a gospel contrary to what you received, let that one be accursed!