Numbers 18:3

3 But as the Levites go about all their assigned duties at the Tabernacle, they must be careful not to go near any of the sacred objects or the altar. If they do, both you and they will 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 Then the LORD said to Aaron: “You, your sons, and your relatives from the tribe of Levi will be held responsible for any offenses related to the sanctuary. But you and your sons alone will be held responsible for violations connected with the priesthood.

2 “Bring your relatives of the tribe of Levi—your ancestral tribe—to assist you and your sons as you perform the sacred duties in front of the Tabernacle of the Covenant.

3 But as the Levites go about all their assigned duties at the Tabernacle, they must be careful not to go near any of the sacred objects or the altar. If they do, both you and they will die.

4 The Levites must join you in fulfilling their responsibilities for the care and maintenance of the Tabernacle, but no unauthorized person may assist you.

5 “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.