Ezekiel 10:9-12

9Then I looked and behold, [there were] four wheels beside the cherubim, one wheel beside one cherub and another wheel beside each other cherub; and the appearance of the wheels was like a sparkling Tarshish stone (beryl).

10As for their appearance, all four looked alike, as if one wheel were within another wheel.

11When they moved, they went in any of their four directions without turning as they went; but they followed in the direction which they faced, without turning as they went.

12Their whole body, their backs, their hands, their wings, and the wheels were full of eyes all around, even the wheels belonging to all four of them.