Midrash for Leviticus 2:2

1) (Vayikra 2:2) ("And he shall bring it to the sons of Aaron, the Cohanim, and he [the Cohein] shall take, etc."): (It could have been written "vehevi" ("And he shall bring.") Why "veheviah"? ("And he shall bring it")? That he not bring it by halves. So that if he said: "I vow to bring a meal-offering of two issaron," he should not bring it in two vessels but in one. "to the sons of Aaron" — even if they are very many (i.e., they can apportion the various services among themselves.) And thus is it written (Mishlei 14:28): "In the multitude of the people is the King's glory." "the Cohanim": We are hereby taught that kemitzah (the taking of the fistful) is the mitzvah of the priesthood. (non-Cohanim may not perform it.) (For without the exclusion clause I would reason:) Does it not follow (that kemitzah does not require a Cohein)? viz.: If shechitah, for which "north" was required, a Cohein was not required, kemitzah, for which north was not required, how much more so should a Cohein not be required! — This argument is refuted by melikah, which does not require "north," yet does require a Cohein. — No, this may be true of melikah because it requires the altar, as opposed to kemitzah, which does not require the altar. And since it does not require the altar, it should not require a Cohein. It is, therefore, written: "… the Cohanim, and he (the Cohein) shall take the fistful" — kemitzah is the mitzvah of the priesthood.

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.

2) I might think that it is a mitzvah for a Cohein to take the fistful, but that if a non-Cohein does so it is also kasher; it is, therefore, written (Mishlei 14:9): "And the Cohein shall lift from the meal-offering its remembrance" (i.e., the fistful") — to stipulate that if a non-Cohein does so it is pasul.