Revelation 15:2

2AndΚαὶI sawεἶδον[something] likeὡςa seaθάλασσανof glassὑαλίνηνmingledμεμιγμένηνwith fireπυρί,andκαὶthoseτοὺςconqueringνικῶνταςoverἐκtheτοῦbeastθηρίουandκαὶofἐκtheτῆςimageεἰκόνοςof itαὐτοῦandκαὶoverἐκtheτοῦnumberἀριθμοῦof theτοῦnameὀνόματοςof itαὐτοῦstandingἑστῶταςuponἐπὶtheτὴνseaθάλασσανof theτὴνglassὑαλίνην,havingἔχονταςharpsκιθάραςτοῦof Godθεοῦ.

And I saw [something] like a sea of glass mixed with fire, and those conquering over the beast and over its image and over the number of its name, standing upon the sea of glass, having harps of God.