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 18:4
And they shall be joined unto thee,.... As assistants in the sacred service:
and keep the charge of tabernacle of the congregation, for all the service of the tabernacle; See Gill on Numbers 3:7 and See Gill on Numbers 3:8,
and a stranger shall not come nigh unto you; not any of the other tribes, only such as were of the tribe of Levi; they only were to be brought with them, and joined unto them, and assist them, and minister to them, as in Numbers 18:2; though the Jews (h) understand by a stranger anyone that was not a priest.
(h) Maimon. in Misn. Zebachim, c. 2. sect. 1.
John Calvin on Numbers 18:1-7