Numbers 18:2-4

International Standard Version

² Moreover, bring your brothers from your father’s tribe of Levi with you, so they may join you and minister to you while you and your sons with you stand in the presence of the Tent of Testimony. ³ They are to take care of your concerns and all the responsibilities involved with the tent. But they’re not to approach the holy vessels or the altar. That way, neither you nor they will die. ⁴ They are to join you to maintain services related to the Tent of Meeting, for all the responsibilities involved with the tent. But no unauthorized person^[a] is to approach you.