Numbers 4:5

“And when the camp setteth forward, etc.] Upon the cloud’s removing and the trumpets blowing: Aaron shall come, and his sons; into the holy place: and they shall take down the covering vail: the vail that divided between the holy and the most holy place, which covered all in the holy of holies out of sight: and cover the ark of testimony with it; together with the mercy seat and cherubim on it, that they might not be seen nor touched by the Levites when they carried them. Now though the high priest himself might not go into the most holy place but once a year, on the day of atonement, yet on this occasion, when the tabernacle was to be taken down, and the things in it to be removed, both he…”

“covering veil--the inner veil, which separated the holy from the most holy place. (See on Exo 36:35).”

“They shall take down - For upon this necessary occasion the inferior priests are allowed to come into the holy of holies, which otherwise was peculiar to the high - priest. The covering veil - The second veil, wherewith the ark was covered while the tabernacle stood, Exo 40:3. Cover the ark - Because the Levites, who were to carry the ark, might neither see, nor immediately touch it. Numbers 4:6”

“And when: Num 2:16, Num 2:17, Num 10:14 Aaron shall come: The law prohibiting any person, except the high priest on one day in the year, to enter into the most holy place, must have admitted an exception while the Israelites were in the wilderness. that exception, therefore, is here expressly made; and the directions given respecting it must be religiously observed, or the service could not be safely performed. While the cloud rested on the tabernacle, the general rule was in force; but when it was removed, then the priests might enter to prepare the sacred vessels for removal. Num 4:15, Num 3:27-32 they shall: Exo 26:31-33, Exo 36:35, Exo 40:3; Isa 25:7; Mat 27:51; Heb 9:3, Heb 10:20 and…”