Revelation 21:24

And [the saved people of] the nations will walk in the city's light, and the kings of the earth will bring their splendor into it.

Revelation 22:2

and down the middle of the city's street. And on each side of the river stood the tree of life; it produced twelve crops of fruit, yielding a crop every month. And the leaves of the tree [served as medicine] for healing the nations.

Romans 15:10-12

And again it says [Deut. 32:43], "Rejoice with His people [i.e., the Jews], you Gentiles."

Romans 15:16

in appointing me to be a minister of Christ Jesus to the Gentiles. I am serving like a priest in preaching God's good news, so that the Gentiles might be like an acceptable sacrifice [to God], dedicated by the Holy Spirit.

Romans 15:26

For [the Christians in] Macedonia and Achaia [Note: These were provinces in Greece] thought it was a good idea to take up an offering for the poor saints at Jerusalem.

Revelation 21:26

And they [i.e., the kings of the earth, Verse 24] will bring the splendor and honor of [the saved people of] the nations into the city. [Note: This verse may involve a slightly different idea from verse 24].

Treasury of Scripture Knowledge

Summary

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.

Bible References

The nations

Revelation 22:2
and down the middle of the city's street. And on each side of the river stood the tree of life; it produced twelve crops of fruit, yielding a crop every month. And the leaves of the tree [served as medicine] for healing the nations.
Romans 15:10
And again it says [Deut. 32:43], "Rejoice with His people [i.e., the Jews], you Gentiles."