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.

Read Numbers 18:5 Using Other Translations

And ye shall keep the charge of the sanctuary, and the charge of the altar: that there be no wrath any more upon the children of Israel.
And you shall keep guard over the sanctuary and over the altar, that there may never again be wrath on the people of Israel.
“You yourselves must perform the sacred duties inside the sanctuary and at the altar. If you follow these instructions, the LORD ’s anger will never again blaze against the people of Israel.