Acts 15:7

15:7 After there had been much debate, Peter stood up and said to them, “Brothers, you know that some time ago God chose me to preach to the Gentiles so they would hear the message of the gospel and believe.

Galatians 1:6-10

Occasion of the Letter

1:6 I am astonished that you are so quickly deserting the one who called you by the grace of Christ and are following a different gospel – 1:7 not that there really is another gospel, but there are some who are disturbing you and wanting to distort the gospel of Christ. 1:8 But even if we (or an angel from heaven) should preach a gospel contrary to the one we preached to you, let him be condemned to hell! 1:9 As we have said before, and now I say again, if any one is preaching to you a gospel contrary to what you received, let him be condemned to hell! 1:10 Am I now trying to gain the approval of people, or of God? Or am I trying to please people? If I were still trying to please people, I would not be a slave of Christ!

Galatians 2:5

2:5 But we did not surrender to them even for a moment, in order that the truth of the gospel would remain with you.

Jude 1:3

Condemnation of the False Teachers

1:3 Dear friends, although I have been eager to write to you about our common salvation, I now feel compelled instead to write to encourage you to contend earnestly for the faith that was once for all entrusted to the saints.