Revelation 15:1-3

Young's Literal Translation

15 And I saw another sign in the heaven, great and wonderful, seven messengers having the seven last plagues, because in these was completed the wrath of God,

² and I saw as a sea of glass mingled with fire, and those who do gain the victory over the beast, and his image, and his mark, [and] the number of his name, standing by the sea of the glass, having harps of God,

³ and they sing the song of Moses, servant of God, and the song of the Lamb, saying, `Great and wonderful [are] Thy works, O Lord God, the Almighty, righteous and true [are] Thy ways, O King of saints,