Revelation 4:6, 8

And in front of the throne there was pavement like a crystal sea of glass. Around the throne and on each side stood four living creatures, full of eyes in front and behind.

Each of the four living creatures had six wings, full of eyes all around and under their wings. They worshiped without ceasing, day and night, singing, “Holy, holy, holy is the Lord God, the Almighty! The Was, the Is, and the Coming!”