Mt 8:11, Acts 1:8, Rev 21:21-27
In the Old Testament, Isaiah prophesied that the nations would come out in the light of God's glory. (Isa 60:3-9)
Isa 60:3 And the Gentiles shall come to thy light, and kings to the brightness of thy rising. 4 Lift up thine eyes round about, and see: all they gather themselves together, they come to thee: thy sons shall come from far, and thy daughters shall be nursed at thy side. 5 Then thou shalt see, and flow together, and thine heart shall fear, and be enlarged; because the abundance of the sea shall be converted unto thee, the forces of the Gentiles shall come unto thee. 6 The multitude of camels shall cover thee, the dromedaries of Midian and Ephah; all they from Sheba shall come: they shall bring gold and incense; and they shall shew forth the praises of the Lord. 7 All the flocks of Kedar shall be gathered together unto thee, the rams of Nebaioth shall minister unto thee: they shall come up with acceptance on mine altar, and I will glorify the house of my glory. 8 Who are these that fly as a cloud, and as the doves to their windows? 9 Surely the isles shall wait for me, and the ships of Tarshish first, to bring thy sons from far, their silver and their gold with them, unto the name of the Lord thy God, and to the Holy One of Israel, because he hath glorified thee.
Jesus also said that many Gentiles from the east and the west will be saved and sit in the kingdom of heaven. (Mt 8:11)
Mt 8:11 And I say unto you, That many shall come from the east and west, and shall sit down with Abraham, and Isaac, and Jacob, in the kingdom of heaven.
We must tell the world that Jesus is the Christ. (Acts 1:8)
Acts 1:8 But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.
Eventually, many Gentiles will be saved and go to heaven. (Rev 21:21-27)
Rev 21:21 And the twelve gates were twelve pearls: every several gate was of one pearl: and the street of the city was pure gold, as it were transparent glass. 22 And I saw no temple therein: for the Lord God Almighty and the Lamb are the temple of it. 23 And the city had no need of the sun, neither of the moon, to shine in it: for the glory of God did lighten it, and the Lamb is the light thereof. 24 And the nations of them which are saved shall walk in the light of it: and the kings of the earth do bring their glory and honour into it. 25 And the gates of it shall not be shut at all by day: for there shall be no night there. 26 And they shall bring the glory and honour of the nations into it. 27 And there shall in no wise enter into it any thing that defileth, neither whatsoever worketh abomination, or maketh a lie: but they which are written in the Lamb's book of life.