Aaron's sons, Nadab and Abihu, set light to their incense burners using ordinary fire and put in incense, and in this way offered forbidden fire in the Lord's presence, something he had not authorized.
Moses told Aaron and his two sons who were left, Eleazar and Ithamar, “Take the grain offering that is left over from the food offerings given to the Lord and eat it without yeast beside the altar, because it is most holy.