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 9:14-15

9:14 saying to the sixth angel, the one holding the trumpet, “Set free the four angels who are bound at the great river Euphrates!” 9:15 Then the four angels who had been prepared for this hour, day, month, and year were set free to kill a third of humanity.

Revelation 11:16

11:16 Then the twenty-four elders who are seated on their thrones before God threw themselves down with their faces to the ground and worshiped God