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. [374] These seven days of retirement were assigned to Aaron and his sons not only as a preparation for their regular service, they had another significance also. God, before bringing the flood upon the earth, observed the seven days preceding as a week of mourning, and in the same way He bade Aaron and his sons live in absolute retirement for a week, as is the duty of mourners, for a heavy loss awaited them - the death of Nadab and Abihu, which took place on the joyous day of their dedication. [375] THE DAY OF THE TEN CROWNS The first day of Nisan was an eventful day, "a day that was distinguished by ten crowns." It was the day on which the princes of the tribes began to bring their offerings; it was the first day on which Shekinah came to dwell among Israel; the first day on which sacrifice on any but the appointed place was forbidden; the first day on which priests bestowed their blessing upon Israel; the first day for regular sacrificial service; the first day on which the priests partook of certain portions of the offering; the first day on which the heavenly fire was seen on the altar; it was besides the first day of the week, a Sunday, the first day of the first month of the year. [376]