Ezekiel 1:13

As for the likeness of the living creatures, the impression made by their appearance in general, their appearance was like burning coals of fire, like kindled coals, and like the appearance of lamps, in a quick and flickering motion, like the play of lightning; it went up and down among the living creatures, moving back and forth between them; and the fire was bright, and out of the fire went forth lightning, in a threatening effect toward the outside.