Revelation 4:6, 8

In front of the throne was a shiny sea of glass, sparkling like crystal. In the center and around the throne were four living beings, each covered with eyes, front and back.

Each of these living beings had six wings, and their wings were covered all over with eyes, inside and out. Day after day and night after night they keep on saying, “Holy, holy, holy is the Lord God, the Almighty— the one who always was, who is, and who is still to come.”