וְהַנּוֹתֶ֣רֶת מִמֶּ֔נָּה יֹאכְל֖וּ אַהֲרֹ֣ן וּבָנָ֑יו מַצּ֤וֹת תֵּֽאָכֵל֙ בְּמָק֣וֹם קָדֹ֔שׁ בַּחֲצַ֥ר אֹֽהֶל־מוֹעֵ֖ד יֹאכְלֽוּהָ׃
A pozostałe z niej jadać będą Ahron i synowie jego. Jako przaśniki jedzoném będzie na miejscu świętém; w dworcu przybytku zboru spożywać to będą.
Mishneh Torah, Positive Mitzvot
That the remainder of the meal-offerings shall be eaten, as it is said, “And the remainder thereof shall Aaron and his sons eat” (Lev. 6:9).
Sefer HaChinukh
The commandment of eating the remainders of the meal-offering: That the priests were commanded to eat the remainders of the meal-offerings — meaning to say after they separated from it that which they would offer on the altar, they would eat all the rest, as it is stated (Leviticus 6:9), “What is left of it shall be eaten by Aharon and his sons; as matsahs shall it be eaten, etc.” And the language of Sifra, Tzav 2:9 is, “‘As matsahs shall it be eaten’ is a commandment; ‘her levirate husband shall have sexual relations with her’ (Deuteronomy 25:5) is a commandment” — meaning to say that both of them are positive commandments, not optional.