'Burning Coals' in the Bible

See, I have made the iron-worker, blowing on the burning coals, and making the instrument of war by his work; and I have made the waster for destruction.

And between the living beings it was like burning coals of fire, as if flames were going one after the other between the living beings; and the fire was bright, and out of the fire went thunder-flames.

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.