Revelation 4:6-8 NIV

[6] Also in front of the throne there was what looked like a sea of glass, clear as crystal. In the center, around the throne, were four living creatures, and they were covered with eyes, in front and in back. [7] The first living creature was like a lion, the second was like an ox, the third had a face like a man, the fourth was like a flying eagle. [8] Each of the four living creatures had six wings and was covered with eyes all around, even under its wings. Day and night they never stop saying: “ ‘Holy, holy, holy is the Lord God Almighty,’ who was, and is, and is to come.”