Numbers 18:5-7  New English Translation

⁵ You will be responsible for the care of the sanctuary and the care of the altar, so that there will be^[a] no more wrath on the Israelites. ⁶ I myself have chosen^[b] your brothers the Levites from among the Israelites. They are given to you as a gift from the Lord, to perform the duties^[c] of the tent of meeting. ⁷ But you and your sons with you are responsible for your priestly duties, for everything at the altar and within the curtain. And you must serve. I give you the priesthood as a gift for service, but the unauthorized person who approaches must be put to death.”