Leviticus 10:10-12

10You are to distinguish between the holy and the common, and between the unclean and the clean,

11and you are to teach the people of Israel all the statutes that the Lord has spoken to them by Moses."

12Moses 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.