Numbers 18:5-19

⁵And ye shall keep the charge of the sanctuary, and the charge of the altar; that there be not any more wrath upon the children of Israel.

⁶And I, behold, I have taken your brethren the Levites from the midst of the children of Israel; unto you are they given as a gift for the Lord, to perform the service of the tabernacle of the congregation.

⁷And thou and thy sons with thee shall keep your priesthood concerning every matter of the altar, and for that within the vail, where ye shall serve: as a service of gift do I give you your priesthood; and the stranger that cometh nigh shall be put to death.

⁸And the Lord spoke unto Aaron, And I, behold, I give thee the charge of my heave-offerings; of all the hallowed things of the children of Israel, unto thee have I given them as an official portion, and to thy sons, as a fixed right for ever.

⁹This shall belong to thee of the most holy things, from the fire-offerings: every oblation of theirs, namely, every meat-offering of theirs, and every sin-offering of theirs, and every, trespass-offering of theirs, which they shall render unto me, shall, as most holy things, belong to thee and to thy sons.

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

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

¹²All the best of oil, and all the best of wine, and of corn, the first-fruits thereof which they shall offer unto the Lord, to thee have I given them.

¹³The first ripe fruit of whatsoever is in their land, which they may bring unto the Lord, shall be thine: every one that is clean in thy house may eat thereof.

¹⁴Every thing devoted in Israel shall be thine.

¹⁵Whatever openeth the womb of all flesh, which they bring unto the Lord, be it of men or of cattle, shall be thine: nevertheless thou shalt redeem the first-born of man, and the firstling of the unclean cattle shalt thou redeem.

¹⁶And those that are to be redeemed from a month old shalt thou redeem, according to the usual estimation of five shekels of silver, after the shekel of the sanctuary, which is twenty gerahs.

¹⁷But the firstling of an ox, or the firstling of a sheep, or the firstling of a goat, thou shalt not redeem; they are holy: their blood shalt thou sprinkle upon the altar, and their fat shalt thou burn as a fire-offering, for a sweet savor unto the Lord.

¹⁸And their flesh shall be thine: as the breast that is waved and as the right shoulder shall it be thine.

¹⁹All the heave-offerings of the holy things, which the children of Israel set apart unto the Lord, I have given to thee, and to thy sons and to thy daughters with thee, as a fixed portion for ever: it is a covenant of salt for ever before the Lord for thee and for thy seed with thee.