Midrasz do Kapłańska 6:9

1) "And what is left (from the meal-offering shall be for Aaron, etc."): even if it were not salted, even if it were not presented (at the southwest corner of the altar) — except if nothing were smoked of its frankincense. "from the meal-offering" — except if it (the meal-offering) were diminished (between kemitzah and smoking), except if nothing were smoked of its frankincense. "for Aaron and for his sons": for Aaron first, and then for his sons; for Aaron without apportionment (with the other Cohanim), and for his sons with apportionment. Just as Aaron, the high-priest, eats without apportionment, so, his sons, the high-priests, eat without apportionment.

4) (Vayikra 10:12) "and eat it unleavened": What is the intent of this? (i.e., it has already been stated, viz. Vayikra 6:9). Because it is a communal meal-offering, and was prescribed only for that time, and not for succeeding generations, it had to be stated "and eat it unleavened."

7) (Vayikra 6:9) ("And what is left of it shall be eaten by Aaron and his sons. It shall be eaten unleavened; in a holy place, in the court of the tent of meeting shall they eat it."): "And what is left of it": of a valid offering, and not of one that became unfit. "shall be eaten by," "It shall be eaten," "shall they eat it": "eatings" are multiplied here (to indicate that they may be eaten in any manner they desire, (fried, cooked, etc.) and that non-consecrated food and terumah may be eaten together with it when it does not suffice (for a meal).