Ezekiel 1:15–21:

“As I looked at the living creatures, I saw a wheel on the ground beside each creature with its four faces. This was the appearance and structure of the wheels: They sparkled like topaz, and all four looked alike. Each appeared to be made like a wheel intersecting a wheel. As they moved, they would go in any one of the four directions the creatures faced; the wheels did not change direction as the creatures went. Their rims were high and awesome, and all four rims were full of eyes all around.

Ezekiel 10:9–13:
“And then I saw four wheels beside the cherubim, one beside each cherub. The wheels radiating were sparkling like diamonds in the sun. All four wheels looked alike, each like a wheel within a wheel. When they moved, they went in any of the four directions but in a perfectly straight line. Where the cherubim went, the wheels went straight ahead. The cherubim were full of eyes in their backs, hands, and wings. The wheels likewise were full of eyes. I heard the wheels called ‘wheels within wheels.’”