Numbers 18:4-7 »They are to work with you and fulfill their responsibilities for all the service in the tent. No unqualified person may work with you.

NSB⁽ⁱ⁾ ⁴ »They are to work with you and fulfill their responsibilities for all the service in the tent. No unqualified person may work with you. ⁵ »You and your sons alone must fulfill the responsibilities for the Holy Place and the altar. That way my anger will not again break out against the people of Israel. ⁶ »I chose the other Levites from among the Israelites to help you. They are a gift given to Jehovah to do the necessary work at the tent of meeting. ⁷ »Only you and your sons may do the work of priests, everything done at the altar and under the canopy. This is my gift to you: You may serve me as priests. Anyone else who comes near the holy place to do this work must die.«