Revelation 4:6, 8

and in front of the throne there was something like a sea or large expanse of glass, like [the clearest] crystal. In the center and around the throne were four living creatures who were full of eyes in front and behind [seeing everything and knowing everything that is around them]. [Ps 99:1; Is 6:2, 3; Ezek 1:5, 18]

And the four living creatures, each one of them having six wings, are full of eyes all over and within [underneath their wings]; and day and night they never stop saying, “HOLY, HOLY, HOLY [is the] LORD GOD, THE ALMIGHTY [the Omnipotent, the Ruler of all], WHO WAS AND WHO IS AND WHO IS TO COME [the unchanging, eternal God].” [Is 6:1-3; Rev 1:4]