Revelation 4:6

4:6 and in front of the throne was something like a sea of glass, like crystal.

In the middle of the throne and around the throne were four living creatures full of eyes in front and in back.

Revelation 4:8

4:8 Each one of the four living creatures had six wings and was full of eyes all around and inside. They never rest day or night, saying:

“Holy Holy Holy is the Lord God, the All-Powerful,

Who was and who is, and who is still to come!”