Revelation 15:1-4 And I saw another sign in heaven, great and marvellous, seven angels having the seven last plagues; for in them is filled up the wrath of G-d. And I saw as it were a sea of glass mingled with fire: and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of G-d. And they sing the song of Moses the servant of G-d, and the song of the Lamb, saying, Great and marvellous are thy works, L-rd G-d Almighty; just and true are thy ways, thou King of saints. Who shall not fear thee, O L-rd, and glorify thy name? for thou only art holy: for all nations shall come and worship before thee; for thy judgments are made manifest. (KJV)
Here we see seven angels preparing to deliver the final 7 plagues.
Revelation 15:2 And I saw as it were a sea of glass mingled with fire: and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of G-d. (KJV)
The "sea of glass" reflects the glory of G-d."
"mingled with fire" speaks of divine judgment proceeding from G-d's holiness.
Notice the group of people standing here before G-d is the believers from the tribulation period. They are described as having "VICTORY" over the beast. These people have just been killed because of their believe in Y'shua and their refusal to follow the Anti-Messiah or to worship his image or to take his mark. By the worlds standards these people are LOSERS! They have refused to go along with the rest of the WORLD and have paid with their very lives. But G-d says that they are the "VICTORS"!!
They sing two songs the "Song of Moses" and the "Song of the Lamb". The "Song of Moses" recounts the faithfulness of G-d to Israel as a nation in recognition that a large number of Israelites are among these martyred dead. The "Song of Moses" is recorded in Deuteronomy 32. The "Song of the Lamb" is in recorded in verses 3 and 4 of this chapter.
The "Song of the Lamb" speaks of redemption from sin made possible by the sacrifice of the Lamb of G-d, and would include all saints.
Revelation 15:5-8 And after that I looked, and, behold, the temple of the tabernacle of the testimony in heaven was opened: And the seven angels came out of the temple, having the seven plagues, clothed in pure and white linen, and having their breasts girded with golden girdles. And one of the four beasts gave unto the seven angels seven golden vials full of the wrath of G-d, who liveth for ever and ever. And the temple was filled with smoke from the glory of G-d, and from his power; and no man was able to enter into the temple, till the seven plagues of the seven angels were fulfilled. (KJV)
We see the 7 angels coming out of the temple of G-d in Heaven. The "temple" (Gr. Naos) refers to the inner holy place of the holy place of the Tabernacle. These angels are coming out of the heavenly "Holy of Holies" indicating that the judgments to be poured out stem from the holiness of G-d and are properly required of G-d who must do all things right. (Walvoord p.229)
The garments worn by these angels' sounds very similar to the clothing worn by the High Priest. (See Ex 28:2) The white linen symbolizes purity and perfection and the Golden girdle across their breasts symbolizes G-d's righteousness and Faithfulness.
They are given 7 bowls filled with the wrath of G-d, which we will see them pour out upon the earth in the next chapter.
The word "wrath" is thymos is literally means "anger".
The temple is filled with smoke proceeding from the glory of G-d and
His power. This account is similar to the Shekinah Glory Cloud in the temple.
(See Ex 40:34-35).