'Coals' in the Bible

"Tell Eleazar son of Aaron the priest to pick up the censers out of the flame, for they are holy, and then scatter the coals of fire at a distance.

Then Moses said to Aaron, "Take the censer, put burning coals from the altar in it, place incense on it, and go quickly into the assembly and make atonement for them, for wrath has gone out from the Lord -- the plague has begun!"

So Aaron did as Moses commanded and ran into the middle of the assembly, where the plague was just beginning among the people. So he placed incense on the coals and made atonement for the people.