Revelation 15:2 in the King James Version
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 God.
Context
1 I saw another great and marvelous sign in the sky: seven angels having the seven last plagues, for in them God’s wrath is finished.
2 I saw something like a sea of glass mixed with fire, and those who overcame the beast, his image, and the number of his name, standing on the sea of glass, having harps of God.
3 They sang the song of Moses, the servant of God, and the song of the Lamb, saying, “Great and marvelous are your works, Lord God, the Almighty! Righteous and true are your ways, you King of the nations.