Ezekiel 1:13-16

1:13 In the middle of the living beings was something like burning coals of fire or like torches. It moved back and forth among the living beings. It was bright, and lightning was flashing out of the fire. 1:14 The living beings moved backward and forward as quickly as flashes of lightning.

1:15 Then I looked, and I saw one wheel on the ground beside each of the four beings. 1:16 The appearance of the wheels and their construction was like gleaming jasper, and all four wheels looked alike. Their structure was like a wheel within a wheel.