Leviticus 10:1; Leviticus 10:12

1 Aaron’s sons Nadab and Abihu took their censers, put fire in them and added incense; and they offered unauthorized fire before the LORD, contrary to his command.

12 Moses said to Aaron and his remaining sons, Eleazar and Ithamar, “Take the grain offering left over from the food offerings prepared without yeast and presented to the LORD and eat it beside the altar, for it is most holy.