'Coals' in the Bible

And the servants and officers stood there, who had made a fire of coals; for it was cold: and they warmed themselves: and Peter stood with them, and warmed himself.

As soon then as they were come to land, they saw a fire of coals there, and fish laid thereon, and bread.

Therefore if thine enemy hunger, feed him; if he thirst, give him drink: for in so doing thou shalt heap coals of fire on his head.