Leviticus 6:16-20

¹⁶And whatever is over Aaron and his sons may have for their food, taking it without leaven in a holy place; in the open space of the Tent of meeting they may take a meal of it.

¹⁷It is not to be cooked with leaven. I have given it to them as their part of the offerings made by fire to me; it is most holy, as are the sin-offerings and the offerings for error.

¹⁸Every male among the children of Aaron may have it for food; it is their right for ever through all your generations, from the offerings made by fire to the Lord: anyone touching them will be holy.

¹⁹And the Lord said to Moses,

²⁰This is the offering which Aaron and his sons are to make to the Lord on the day when he is made a priest: the tenth part of an ephah of the best meal for a meal offering for ever; half of it in the morning and half in the evening.