'Burning Coals' in the Bible

As for the likeness of the living creatures, their appearance was like burning coals of fire, and like the appearance of lamps: it went up and down among the living creatures; and the fire was bright, and out of the fire went forth lightning.

And he said to the man clothed in linen, Go in between the wheels, under the winged ones, and get your two hands full of burning coals from between the winged ones and send them in a shower over the town. And he went in before my eyes.

And {make it stand} empty upon its burning coals so that it may become hot, and its copper may become molten and be melted in the midst of it, [so that] its uncleanness and its rust be consumed.