Parallel
Numbers 18:4
Jewish Publication Society 1917 · Berean Standard Bible
And they shall be joined unto thee, and keep the charge of the tent of meeting, whatsoever the service of the Tent may be; but a common man shall not draw nigh unto you.
They are to join you and attend to the duties of the Tent of Meeting, doing all the work at the Tent; but no outsider may come near you.