Revelation 15:2

15:2 I saw something like a sea of glass mixed with fire, and those who overcame the beast, his image,{TR adds "his mark,"} and the number of his name, standing on the sea of glass, having harps of God.
-World English Bible

Other Translation

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 God.
-King James Version