And you shall attend to the duties of the sanctuary and the duties of the altar, that there may be no more wrath on the children of Israel.
Numbers 18:5
Surrounding context
18:4 They shall be joined with you and attend to the needs of the tabernacle of meeting, for all the work of the tabernacle; but an outsider shall not come near you.
18:5 And you shall attend to the duties of the sanctuary and the duties of the altar, that there may be no more wrath on the children of Israel.
18:6 Behold, I Myself have taken your brethren the Levites from among the children of Israel; they are a gift to you, given by the LORD, to do the work of the tabernacle of meeting.