Numbers 18:4
Ver. 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 "Nu 3:7" and See Gill on "Nu 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 Nu 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.