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. The first of these living beings was like a lion; the second was like an ox; the third had a human face; and the fourth was like an eagle in flight. 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