Moses did as he was bidden, and in presence of all the people took place the election of Aaron and his sons as priests, whereupon these retired for a week to the door of the Tabernacle. During this week, in preparing the burnt offering and the sin offering, Moses showed his brother Aaron and Aaron's sons how to perform the different priestly functions in the sanctuary. Moses made a sin offering because he feared that among the gifts out of which the sanctuary had been constructed, there might have been ill-gotten gains, and God loves justice and hates loot as an offering, Moses through a sin offering sought to obtain forgiveness for a possible wrong.
During this week, however, the sanctuary was only temporarily used. Moses would set it up mornings and evenings, then fold it together again, and it was not until this week had passed that the sanctuary was committed to the general use. After that it was not folded together except when they moved from on encampment to another.