Numbers 18:5-13

⁵And ye shall keep the charge of the holy things, and the charge of the altar, that there be wrath no more upon the children of Israel.

⁶And I, behold, I have taken your brethren the Levites from among the children of Israel; for you they are given as a gift unto the LORD, to do the service of the tent of meeting.

⁷And thou and thy sons with thee shall keep your priesthood in everything that pertaineth to the altar, and to that within the veil; and ye shall serve; I give you the priesthood as a service of gift; and the common man that draweth nigh shall be put to death.'

⁸And the LORD spoke unto Aaron: 'And I, behold, I have given thee the charge of My heave-offerings; even of all the hallowed things of the children of Israel unto thee have I given them for a consecrated portion, and to thy sons, as a due for ever.

⁹This shall be thine of the most holy things, reserved from the fire: every offering of theirs, even every meal-offering of theirs, and every sin-offering of theirs, and every guilt-offering of theirs, which they may render unto Me, shall be most holy for thee and for thy sons.

¹⁰In a most holy place shalt thou eat thereof; every male may eat thereof; it shall be holy unto thee.

¹¹And this is thine: the heave-offering of their gift, even all the wave-offerings of the children of Israel; I have given them unto thee, and to thy sons and to thy daughters with thee, as a due for ever; every one that is clean in thy house may eat thereof.

¹²All the best of the oil, and all the best of the wine, and of the corn, the first part of them which they give unto the LORD, to thee have I given them.

¹³The first-ripe fruits of all that is in their land, which they bring unto the LORD, shall be thine; every one that is clean in thy house may eat thereof.