Albert Barnes Commentary Revelation 21:24

"And the nations shall walk amidst the light thereof: and the kings of the earth bring their glory into it." — Revelation 21:24 (ASV)

And the nations of them which are saved. All the nations that are saved, or all the saved considered as nations. This imagery is doubtless derived from that in Isaiah, particularly Isaiah 60:3-9. See Barnes on Isaiah 60:3 and following.

Shall walk in the light of it. Shall enjoy its splendor and be continually in its light.

And the kings of the earth do bring their glory and honor into it. All that they consider as constituting their glory: treasures, crowns, scepters, robes. The idea is, that all these will be devoted to God in the future days of the church in its glory, and will be, as it were, brought and laid down at the feet of the Savior in heaven. The language is doubtless derived from the description in Isaiah 60:3-14. Compare Isaiah 49:23.