A.T. Robertson Commentary Revelation 21:9

"And there came one of the seven angels who had the seven bowls, who were laden with the seven last plagues; and he spake with me, saying, Come hither, I will show thee the bride, the wife of the Lamb." — Revelation 21:9 (ASV)

One of the seven angels (εις εκ των επτα αγγελων). As in 17:1 with the same introduction when the angel made the announcement about the harlot city (Babylon), so here the description of the heavenly city, the New Jerusalem, is given by one of the same group of angels who had the seven bowls. Thus the νυμφη (Bride) is placed in sharp contrast with the πορνη (Harlot). The New Jerusalem was briefly presented in verse 2, but now is pictured at length (21:9-22:5) in a nearer and clearer vision.

The bride the wife of the Lamb (την νυμφην την γυναικα του αρνιου). Twice already the metaphor of the Bride has been used (19:7; 21:2), here termed "wife" (γυναικα), mentioned proleptically as in 19:7 if the marriage is not yet a reality. For the use of the same metaphor elsewhere in the N.T. see on 19:7.