Numbers 18:2–7

²So bring with you also your brothers of the tribe of Levi, your ancestral tribe, in order that they may be joined to you and serve you while you and your sons with you are in front of the tent of the covenant.^{* 3}They shall perform duties for you and for the whole tent. But they must not approach either the utensils of the sanctuary or the altar, or else both they and you will die.^{* 4}They are attached to you in order to perform the duties of the tent of meeting, for all the service of the tent; no outsider shall approach you.^{* 5}You yourselves shall perform the duties of the sanctuary and the duties of the altar, so that wrath may never again come upon the Israelites.^{* 6}It is I who now take your brother Levites from among the Israelites; they are now yours as a gift, dedicated to the Lord, to perform the service of the tent of meeting.^{* 7}But you and your sons with you shall diligently perform your priestly duties in all that concerns the altar and the area behind the curtain. I give your priesthood as a gift;^k any outsider who approaches shall be put to death.”^*