Leviticus 10:1; Leviticus 10:12

1 Now Nadab and Abihu, the sons of Aaron, each took his censer and put fire in it and laid incense on it and offered unauthorized fire before the LORD, which he had not commanded them.

12 Moses spoke to Aaron and to Eleazar and Ithamar, his surviving sons: "Take the grain offering that is left of the LORD's food offerings, and eat it unleavened beside the altar, for it is most holy.