Ezekiel 1:12-14

12 Each [living creature] moved in the direction of any of its faces; in whichever direction the spirit wanted to go, they went, without turning as they moved —

13 thus the appearance of the living creatures. With them was something that looked like fiery coals burning the way torches do, with the fire flashing here and there between the living creatures; the fire had a brilliance, and out of the fire went lightning.

14 The living creatures kept speeding here and there like flashes of lightning.