Revelation 4:6

6Andκαὶbeforeἐνώπιονtheτοῦthroneθρόνου[was something] likeὡςa seaθάλασσαof glassὑαλίνηlikeὁμοίαcrystalκρυστάλλῳ.AndΚαὶinἐν[the] midstμέσῳof theτοῦthroneθρόνουandκαὶaroundκύκλῳtheτοῦthroneθρόνου[were] fourτέσσαραliving creaturesζῷαbeing fullγέμονταof eyesὀφθαλμῶνin frontἔμπροσθενandκαὶbehindὄπισθεν·

And before the throne [was] like a sea of glass, like crystal. And in the midst of the throne and around the throne [were] four living creatures, being full of eyes in front and behind.