Numbers 4:5

Overview - Numbers 4
The age at which the Levites were to begin to serve, and the duration of the service.
The duty of the Kohathites.
16 The charge of Eleazar.
17 The office of the priests.
21 The duty of the Gershonites;
29 of the Merarites.
34 The number of the Kohathites;
38 of the Gershonites
42 and of the Merarites.
Treasury of Scripture Knowledge

Numbers 4:5  (King James Version)
And when the camp setteth forward, Aaron shall come, and his sons, and they shall take down the covering vail, and cover the ark of testimony with it:

And when
Numbers 2:16 Numbers 2:17 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.
15 ; 3:27-32

they shall
Exodus 26:31-33 ; 36:35 40:3 Isaiah 25:7 ; Matthew 27:51 ; Hebrews 9:3 ; 10:20

and cover
Exodus 25:10-22 ; 37:1-9 2 Samuel 6:2-9