Numbers 18:4-6

New International Version - UK

⁴ They are to join you and be responsible for the care of the tent of meeting – all the work at the tent – and no one else may come near where you are.

⁵ ‘You are to be responsible for the care of the sanctuary and the altar, so that my wrath will not fall on the Israelites again. ⁶ I myself have selected your fellow Levites from among the Israelites as a gift to you, dedicated to the Lord to do the work at the tent of meeting.