Ezekiel 10:9-11

9And when I looked, there were four wheels by the cherubim, one wheel by one cherub and another wheel by each other cherub; the wheels appeared to have the color of a beryl stone.

10As for their appearance, all four looked alike—as it were, a wheel in the middle of a wheel.

11When they went, they went toward any of their four directions; they did not turn aside when they went, but followed in the direction the head was facing. They did not turn aside when they went.