Simeon declared that the child Jesus had come as "a light for revelation to the Gentiles" (Luke 2:32 ESV), and Jesus commanded his disciples to "make disciples of all nations." (Matthew 28:19 ESV) But what that meant did not sink in for a while, even after Pentecost.

It was after an angel told the Gentile centurion Cornelius to send for Peter that Peter said, "Truly I understand that God shows no partiality, but in every nation anyone who fears him and does what is right is acceptable to him." (Acts 10:34-35 ESV)

And while Peter was still speaking to Cornelius and the crowd that there, "the Holy Spirit fell on all who heard the word. And the believers from among the circumcised who had come with Peter were amazed, because the gift of the Holy Spirit was poured out even on the Gentiles." (Acts 10:44-45 ESV)

Later the apostle Paul provided a full-throated affirmation of the gospel being meant for the gentiles when he said, "And the Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel beforehand to Abraham, saying, 'In you shall all the nations be blessed.' So then, those who are of faith are blessed along with Abraham, the man of faith. [...] There is neither Jew nor Greek, ... for you are all one in Christ Jesus." (Gal. 3:8-9, 28 ESV)

And John was given the ultimate vision of shared heavenly glory: "After this I looked, and behold, a great multitude that no one could number, from every nation, from all tribes and peoples and languages, standing before the throne and before the Lamb, clothed in white robes, with palm branches in their hands, and crying out with a loud voice, 'Salvation belongs to our God who sits on the throne, and to the Lamb!'" (Rev. 7:9-10 ESV)