Ezekiel 10:9-12

9And I looked, and behold, four wheels beside the cherubim, one wheel beside one cherub, and another wheel beside another cherub: and the appearance of the wheels was as the colour of a beryl stone.

10And as for their appearance, they four had one likeness, as if a wheel had been within a wheel.

11When they went, they went upon their four sides: they turned not as they went, but to the place whither the head looked they followed it; they turned not as they went.

12And their whole body, and their backs, and their hands, and their wings, and the wheels, were full of eyes round about, even the wheels that they four had.