And within the vail. — i.e., the vail which separated the holy place from the most holy. The word which is employed in this place (parocheth) is used only of the second vail. (See Leviticus 16:12.) When the outer vail or hanging is designed to be understood, the word used is masak. The reference appears to be to the whole of the priestly duties which were discharged by Aaron and his sons, from those connected with the altar of burnt offering to those which were performed in the most holy place.
Related Commentaries of Numbers 18:7
Numbers 18:7
7 Therefore thou and thy sons with thee shall keep your priest's office for every thing of the altar, and within the vail; and ye shall serve: I have given your priest's office unto you as a service of gift: and the stranger that cometh nigh shall be put to death.