וּמִשְׁפַּ֥ט הַכֹּהֲנִ֖ים אֶת־הָעָ֑ם כָּל־אִ֞ישׁ זֹבֵ֣חַ זֶ֗בַח וּבָ֨א נַ֤עַר הַכֹּהֵן֙ כְּבַשֵּׁ֣ל הַבָּשָׂ֔ר וְהַמַּזְלֵ֛ג שְׁלֹ֥שׁ־הַשִּׁנַּ֖יִם בְּיָדֽוֹ׃
Adapun kebiasaan para imam terhadap rakyat ialah demikian: setiap kali seseorang mempersembahkan korban sembelihan, datanglah pelayan imam itu saat daging sedang dimasak, dengan garpu bergigi tiga di tangannya.
Rashi
The custom of the kohanim. They established this law for themselves, since they rightfully inherited only the breast and the thigh of the peace offering.