Leviticus 10:11-12

10:11 and to teach the Israelites all the statutes that the Lord has spoken to them through Moses.”

Perpetual Statutes Moses spoke to Aaron

10:12 Then Moses spoke to Aaron and to Eleazar and Ithamar, his remaining sons, “Take the grain offering which remains from the gifts of the Lord and eat it unleavened beside the altar, for it is most holy.