1. Christ, who will appear richly to the gentiles (Col 1:27)
    Eph 3:6, Isa 42:6, Is 45:22, Isa 49:6, Isa 52:10, Isa 60:1-3,
    Ps 22:27, Ps 98:2-3, Acts 13:46-49

In the Old Testament it was prophesied that God would bring salvation to the Gentiles. (Isa 45:22, Isa 52:10, Ps 22:27, Ps 98:2-3)

Isa 45:22 Look unto me, and be ye saved, all the ends of the earth: for I am God, and there is none else.

Isa 52:10 The Lord hath made bare his holy arm in the eyes of all the nations; and all the ends of the earth shall see the salvation of our God.

Ps 22:27 All the ends of the world shall remember and turn unto the Lord: and all the kindreds of the nations shall worship before thee.

Ps 98:2 The Lord hath made known his salvation: his righteousness hath he openly shewed in the sight of the heathen.
3 He hath remembered his mercy and his truth toward the house of Israel: all the ends of the earth have seen the salvation of our God.

In the Old Testament, it was foretold that God would bring salvation to the Gentiles through Christ. (Isa 42:6, Isa 49:6, Isa 60:1-3)

Isa 42:6 I the Lord have called thee in righteousness, and will hold thine hand, and will keep thee, and give thee for a covenant of the people, for a light of the Gentiles;

Isa 49:6 And he said, It is a light thing that thou shouldest be my servant to raise up the tribes of Jacob, and to restore the preserved of Israel: I will also give thee for a light to the Gentiles, that thou mayest be my salvation unto the end of the earth.

Isa 60:1 Arise, shine; for thy light is come, and the glory of the Lord is risen upon thee.
2 For, behold, the darkness shall cover the earth, and gross darkness the people: but the Lord shall arise upon thee, and his glory shall be seen upon thee.
3 And the Gentiles shall come to thy light, and kings to the brightness of thy rising.

Many Gentiles believed in Jesus as the Christ and were saved. (Col 1:27, Eph 3:6, Acts 13:46-49)

Col 1:27 To whom God would make known what is the riches of the glory of this mystery among the Gentiles; which is Christ in you, the hope of glory:

Eph 3:6 That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel:

Acts 13:46 Then Paul and Barnabas waxed bold, and said, It was necessary that the word of God should first have been spoken to you: but seeing ye put it from you, and judge yourselves unworthy of everlasting life, lo, we turn to the Gentiles.
47 For so hath the Lord commanded us, saying, I have set thee to be a light of the Gentiles, that thou shouldest be for salvation unto the ends of the earth.
48 And when the Gentiles heard this, they were glad, and glorified the word of the Lord: and as many as were ordained to eternal life believed.
49 And the word of the Lord was published throughout all the region.