'Coals' in the Bible

Now the servants and the police had made a fire of coals because it was cold; they were warming themselves in front of it and Peter was there with them, warming himself.

When they got to land, they saw a fire of coals there, with fish cooking on it, and bread.

But if one who has hate for you is in need of food or of drink, give it to him, for in so doing you will put coals of fire on his head.