Numbers 18:3

3 They will perform their duties for you and the service for the entire tent. But they will not approach the holy equipment of the sanctuary or the altar, lest both they and you die.

Numbers 18:3 Meaning and Commentary

Numbers 18:3

And they shall keep thy charge, and the charge of all the
tabernacle
That is, the Levites, whatever Aaron and his sons, the priests, should charge them to do, or commit to their care and charge, that they should observe; as to watch and keep out all unfit persons, to take down and set up the tabernacle when needful only they shall not come nigh the vessels of the sanctuary;
as the ark and mercy seat in the holy of holies, the shewbread table, and candlestick in the holy place; wherefore when these were removed from place to place in journeying, they were covered, that they might not touch them as they carried them: and the altar;
both of incense and burnt offering, on neither of which might they offer: that neither they nor you also die:
the priests for suffering them to meddle with things that did not belong to them, and the Levites for intruding themselves.

Numbers 18:3 In-Context

1 The LORD said to Aaron: You, your sons, and your household will bear the guilt of offenses connected with the sanctuary. You and your sons will bear the guilt of offenses connected with your priesthood.

2 Bring with you your brothers from the tribe of Levi, your father's tribe, so that they can assist you and serve you and your sons before the covenant tent.

3 They will perform their duties for you and the service for the entire tent. But they will not approach the holy equipment of the sanctuary or the altar, lest both they and you die.

4 They will assist you and they will perform the duties of the meeting tent with regard to all the work of the tent. But no outsider may accompany you.

5 You will perform the duties of the sanctuary and the altar. Then there will no longer be any anger against the Israelites.