Revelation 4:6
Also in front of the throne there was something like a sea of glass as clear as crystal. Around the throne, at the middle of each side were four living creatures dotted with eyes in front and behind,
Revelation 4:8
And the four living creatures have each of them six wings, and they are dotted with eyes all around and beneath the wings. And day and night they never cease saying: "Holy, holy, holy is the Lord God, the Almighty, who was and is and is to come."
Treasury of Scripture Knowledge
Summary
As for their rings, they were so high that they were dreadful; and their rings were full of eyes round about them four.
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Revelation 4:6
Also in front of the throne there was something like a sea of glass as clear as crystal. Around the throne, at the middle of each side were four living creatures dotted with eyes in front and behind,