Mark 16:15-16

15 And He said to them, “Go into all the world and preach the gospel to every creature. 16 He who believes and is baptized will be saved; but he who does not believe will be condemned.

Matthew 28:18-20

18 And Jesus came and spoke to them, saying, “All authority has been given to Me in heaven and on earth. 19 Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, 20 teaching them to observe all things that I have commanded you; and lo, I am with you always, even to the end of the age.” Amen.

THERE IS ONLY ONE GOSPEL:
Galatians 1:6-9

6 I marvel that you are turning away so soon from Him who called you in the grace of Christ, to a different gospel, 7 which is not another; but there are some who trouble you and want to pervert the gospel of Christ.

8 But even if we, or an angel from heaven, preach any other gospel to you than what we have preached to you, let him be accursed.

9 As we have said before, so now I say again, if anyone preaches any other gospel to you than what you have received, let him be accursed.