Matt 24:14 This gospel of the kingdom shall be preached in the whole world as a testimony to all the nations, and then the end will come.
Gal 1:6-9
6 I am amazed that you are so quickly deserting Him who called you by the grace of Christ, for a different gospel, 7 which is not just another account; but there are some who are disturbing you and want to distort the gospel of Christ. 8 But even if we, or an angel from heaven, should preach to you a gospel contrary to what we have preached to you, he is to be accursed! 9 As we have said before, even now I say again: if anyone is preaching to you a gospel contrary to what you received, he is to be accursed!
Gal 3:8
8 The Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel beforehand to Abraham, saying, “All the nations will be blessed in you.”
Rom 2:13-16
13 for it is not the hearers of the Law who are righteous before God, but the doers of the Law who will be justified. 14 For when Gentiles who do not have the Law instinctively perform the requirements of the Law, these, though not having the Law, are a law to themselves, 15 in that they show the work of the Law written in their hearts, their conscience testifying and their thoughts alternately accusing or else defending them, 16 on the day when, according to my gospel, God will judge the secrets of mankind through Christ Jesus.
Rev 14:6-7
6 And I saw another angel flying in midheaven with an eternal gospel to preach to those who live on the earth, and to every nation, tribe, language, and people; 7 and he said with a loud voice, “Fear God and give Him glory, because the hour of His judgment has come; worship Him who made the heaven and the earth, and sea and springs of waters.”