Revelation 15:1-2

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,