NUM 18:7

7 Soothly 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. (Thou and thy sons, do your priestly duties; and all the things in the service of the altar, and that be within the Veil, shall be the priests’ responsibility; if any stranger nigheth thereto, he shall be put to death.)