The Vision of Saint John

"And round the throne, on each side of the throne, are four living creatures, full of eyes in front and behind: the first living creature like a lion, the second living creature like an ox, the third living creature with the face of a man, and the fourth living creature like a flying eagle. And the four living creatures, each of them with six wings, are full of eyes all round and within.

- Apocalypse 4:6-9.