Numbers 18:1-5

¹And the LORD said unto Aaron: 'Thou and thy sons and thy fathers' house with thee shall bear the iniquity of the sanctuary; and thou and thy sons with thee shall bear the iniquity of your priesthood.

²And thy brethren also, the tribe of Levi, the tribe of thy father, bring thou near with thee, that they may be joined unto thee, and minister unto thee, thou and thy sons with thee being before the tent of the testimony.

³And they shall keep thy charge, and the charge of all the Tent; only they shall not come nigh unto the holy furniture and unto the altar, that they die not, neither they, nor ye.

⁴And they shall be joined unto thee, and keep the charge of the tent of meeting, whatsoever the service of the Tent may be; but a common man shall not draw nigh unto you.

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.