Deuteronomy 18:3

מאת העם [AND THIS SHALL BE THE PRIESTS’ DUE] FROM THE PEOPLE — but not from the priest (i.e. if a priest slaughters animals for his own use he is exempt from giving these dues to another priest) (Sifrei Devarim 165:3; cf. Chullin 132b). אם שור אם שה WHETHER IT BE ONE OF THE HERD OR ONE OF THE FLOCK — this excludes an undomesticated beast (חיה). הזרע THE SHOULDER is the portion from the knee-joint to the shoulder-blade that is called espalte in old French (cf. Rashi on Chullin 134b). והלחיים THE TWO CHEEKS — together with the tongue. — Those who interpret the Bible text symbolically (cf. Chullin 134b) said: The זרוע of the animals, (termed יד in later Hebrew), became the due of the priests as a reward for the “hand’’ (יד) which Phineas, the priest, raised against the wrong-doers, as it is said. (Numbers 25:7) “and he took a javelin in his hand”; the “cheek-bones” together with the tongue are a reward for the prayer he offered, as it is said, (Psalms 106:30) “Then stood up Phineas and prayed”; והקבה AND THE MAW — as a reward for his act described thus (Numbers 25:8): “[And he thrust both of them through, the man of Israel] and the woman in her stomach (קבתה) (Chullin 134b).

וְזֶ֡ה יִהְיֶה֩ מִשְׁפַּ֨ט הַכֹּהֲנִ֜ים מֵאֵ֣ת הָעָ֗ם מֵאֵ֛ת זֹבְחֵ֥י הַזֶּ֖בַח אִם־שׁ֣וֹר אִם־שֶׂ֑ה וְנָתַן֙ לַכֹּהֵ֔ן הַזְּרֹ֥עַ וְהַלְּחָיַ֖יִם וְהַקֵּבָֽה׃

And this shall be the priest’s allotment from the people, from those who offer a sacrifice, whether it be ox or sheep; they shall give to the priest the shoulder, and the two cheeks, and the maw.