Leviticus 6:16-20

And Aaron and his sons are to eat what is left of it. It shall be eaten as unleavened cakes in a holy place; they are to eat it in the courtyard of the tent of meeting.

It shall not be baked with leaven. I have given it as their share from My offerings by fire; it is most holy, like the sin offering and the guilt offering.

Every male among the sons of Aaron may eat it; it is a permanent ordinance throughout your generations, from the offerings by fire to the Lord. Whoever touches them will become consecrated.’ ”

Then the Lord spoke to Moses, saying,

“This is the offering which Aaron and his sons are to present to the Lord on the day when he is anointed; the tenth of an ephah of fine flour as a regular grain offering, half of it in the morning and half of it in the evening.