Numbers 18:6-9

⁶Lo! I have given to you your brethren, the deacons or Levites, from the midst of the sons of Israel, and I have given you them a free gift of the Lord, that they serve in the services of the tabernacle.

⁷Soothly thou and thy sons, keep your priesthood; and all things that pertain to the adorning of the altar, and be within the veil, shall be ministered by the priests; if any stranger nigheth thereto, he shall be slain.

⁸The Lord spake to Aaron, Lo! I have given to thee the keeping of my first fruits; I have given to thee, and to thy sons, all things that be hallowed of the sons of Israel, for the priest’s office everlasting lawful things.

⁹Therefore thou shalt take these things of those things that be hallowed, and be offered to the Lord; each offering, and sacrifice, and whatever thing is yielded to me for sin and for trespass, and cometh into holy of holy things, shall be thine and thy sons.