Leviticus 10:10-12

10that you may distinguish between holy and unholy, and between unclean and clean,

11and that you may teach the children of Israel all the statutes which the Lord has spoken to them by the hand of Moses.”

12And Moses spoke to Aaron, and to Eleazar and Ithamar, his sons who were left: “Take the grain offering that remains of the offerings made by fire to the Lord, and eat it without leaven beside the altar; for it is most holy.