Devarim 18:3-5

Orthodox Jewish Bible

³ And this shall be the mishpat hakohanim (the right of the kohanim) from the people, from them that offer the zevach, whether it be shor or seh; and they shall give unto the kohen the shoulder, and the two jowls, and the stomach.

⁴ The reshit also of thy grain, of thy wine, and of thine oil, and the reshit of the shearing of thy tzon, shalt thou give him.

⁵ For Hashem Eloheicha hath chosen him out of all thy tribes, to stand to minister in the Shem of Hashem, he and his banim kol hayamim.