Numbers 18:6-7 ▼

6 Look, I have selected your fellow Levites from the Israelites as a gift for you, assigned by the LORD to work at the tent of meeting.

7 But you and your sons will carry out your priestly responsibilities for everything concerning the altar and for what is inside the curtain, and you will do that work. I am giving you the work of the priesthood as a gift, but an unauthorized person who comes near the sanctuary will be put to death.”