Numbers 18:3

3 and the deacons shall (stand) watch at thy commandments, and at all the works of the tabernacle; so only that they nigh not to the vessels of the saintuary, and to the altar, lest both they die, and ye, and (you all) perish together. (and the Levites shall do thy commands, and all their work in the Tabernacle; but they must not go near the vessels of the sanctuary, lest both they and ye die, and all of you perish together.)

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 And the Lord said to Aaron, Thou, and thy sons, and the house of thy father with thee, shall bear the wickedness of the saintuary; and thou and thy sons together shall suffer the sins of your priesthood (but only thou and thy sons shall bear the sins of your priesthood).

2 But also take thou with thee thy brethren of the lineage of Levi, and the sceptre, or power, of thy father, and be they ready, that they minister to thee. Forsooth thou and thy sons shall minister in the tabernacle of witnessing; (And also take with thee thy brothers from the tribe of Levi, thy father's tribe, and be they ready to serve thee. But thou and thy sons shall minister in the Tabernacle of the Witnessing;)

3 and the deacons shall (stand) watch at thy commandments, and at all the works of the tabernacle; so only that they nigh not to the vessels of the saintuary, and to the altar, lest both they die, and ye, and (you all) perish together. (and the Levites shall do thy commands, and all their work in the Tabernacle; but they must not go near the vessels of the sanctuary, lest both they and ye die, and all of you perish together.)

4 Soothly be they with thee, and (stand) watch they in the keepings of the tabernacle, and in all the ceremonies thereof. An alien shall not be meddled with you. (Yea, be they with thee, and do their duties in the Tabernacle, and at all of its ceremonies. But do not let a foreigner, or a stranger, be mixed in with you.)

5 (Stand) Watch ye in the keeping of the saintuary, and in the service of the altar, lest indignation rise upon the sons of Israel. (Do ye all your duties in the sanctuary, and in the service of the altar, lest indignation rise upon the Israelites.)