Rev. 15: 2 And I saw something like a sea of glass mixed with fire, and those who had been victorious [a]over the beast and his image and the number of his name, standing on the sea of glass, holding harps of God. 3 And they *sang the song of Moses, the bond-servant of God, and the song of the Lamb, saying, “Great and marvelous are Your works, O Lord God, the Almighty; Righteous and true are Your ways, King of the [b]nations! 4 “Who will not fear, O Lord, and glorify Your name? For You alone are holy; For all the nations will come and worship before You, For Your [c]righteous acts have been revealed.”
Revelation 15:2 - 4
ESV - 2 And I saw what appeared to be a sea of glass mingled with fire - and also those who had conquered the beast and its image and the number of its name, standing beside the sea of glass with harps of God in their hands. 3 And they sing the song of Moses, the servant of God, and the song of the Lamb, saying, "Great and amazing are your deeds, O Lord God the Almighty! Just and true are your ways, O King of the nations!
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
The Sea of Glass is before God's throne. Rev,. 4:6. Who are the people can be found in verse 2: "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. "Them" are the Tribulation saints who overcame with their faith in Christ Jesus during the Tribulation. These Tribulation saints refused to submit to the Anti-Christ. They praised and worship God for His power and His righteousness.