Matthew Henry on Numbers 18:1-7
The coherence of this chapter with that foregoing is very observable.
I. The people, in the close of that chapter, had complained of the difficulty and peril that there were in drawing near to God, which put them under some dreadful apprehensions that the tabernacle in the midst of them, which they hoped would have been their joy and glory, would rather be their terror and ruin. Now, in answer to this complaint, God here gives them to understand by Aaron that the priests should come near for them as their representatives; so that, though the people were obliged to keep their distance, yet that should not at all redound to their disgrace or prejudice, but their comfortable communion with God…
Read the whole note in the consoleJamieson-Fausset-Brown on Numbers 18:2
thy brethren also of the tribe of Levi--The departments of the sacred office, to be filled respectively by the priests and Levites, are here assigned to each. To the priests was committed the charge of the sanctuary and the altar, while the Levites were to take care of everything else about the tabernacle. The Levites were to attend the priests as servants--bestowed on them as "gifts" to aid in the service of the tabernacle--while the high and dignified office of the priesthood was a "service of gift." "A stranger," that is, one, neither a priest nor a Levite, who should intrude into any departments of the sacred office, should incur the penalty of death.
John Gill on Numbers 18:5
And ye shall keep the charge of the sanctuary,.... That is, the priests, Aaron and his sons; the high priest was to keep the charge of the most holy place particularly, and do what was to be done in that on the day of atonement; and the common priests to keep the charge of the holy place, and do everything relating to the altar of incense, the shewbread table, and candlestick:
and the charge of the altar; of burnt offering, which stood in the court of the tabernacle:
that there be no wrath any more upon the children of Israel: as had been upon Korah and his company, Numbers 16:32, and as afterwards came on Uzziah, 2 Chronicles 26:19.
John Calvin