Ezekiel 1:15-17

15Now as I looked at the living creatures, behold, a wheel was on the earth beside each living creature with its four faces.

16The appearance of the wheels and their workings was like the color of beryl, and all four had the same likeness. The appearance of their workings was, as it were, a wheel in the middle of a wheel.

17When they moved, they went toward any one of four directions; they did not turn aside when they went.