D6 A 15:1. The seven angels.
B 2-4. Worship offered.
A 5-7. The seven angels.
B 8. Worship no longer possible.
2: And I saw as it were a glassy sea (= purity) mingled with fire: And them that had gotten the victory over the beast (see 2:7), and over the image, and over the number of his name, standing on the glassy sea, having the harps of God. (They and only they. Its time for for the music)
3: And they sing the song of Moses (Deut. 32.) the servant of God, and the song of the Lamb, (Two songs are specified in this verse. In connection with the "song of the Lamb" cp. Ps. 86:9-12. Isa. 66:15,16,23. Zeph. 2:11. Zech. 14:15,16 &c. "Great...made manifest" [v.3,4]. These are the words of the song of the Lamb; distinct from, but the compliment of, the song of Moses.), saying, "Great and marvelous are Your works, O Lord God the Almighty; just and true are Your ways,You King of saints (the text reads "nations").
4: Who shall revere You, O Lord, and glorify Your name? for You only are holy: for all the nations shall come and worship before You, for Your righteous sentence were made manifest." (He is just and fair. He gives out rewards and punishments. See 19:6-9)
5: And after that I saw, and, the Temple of the tabernacle of the testimony (=the evidence) in heaven was opened:
6: And the seven angels came out of the Temple, having the seven plagues, clothed with precious stones (see 2:17) pure and bright, and girt about their breast with golden girdles.
7: And one of the four living creatures gave to the seven angels seven golden vials full of the wrath of God (God's answer to prayers on enemy. There is no wrath for God's children, only His enemies.), Who lives for ever and ever.
8: And the Temple was filled with smoke from the glory of God, and from His power; and no one was able to enter into the Temple, till the seven plagues of the seven angels were fulfilled. (The door to heaven is shut at this time. No "rapture". But don't worry, IF your not His enemy He will protect you right were you are at. Remember and go to the story of the three Hebrew children, Shadrach, Mechach, and Abednego, in the Book of Daniel)