Leviticus 8:31-35

Then Moses said to Aaron and to his sons, “Boil the flesh at the doorway of the tent of meeting, and eat it there together with the bread which is in the basket of the ordination offering, just as I commanded, saying, ‘Aaron and his sons shall eat it.’

And the remainder of the flesh and of the bread you shall burn in the fire.

And you shall not go outside the doorway of the tent of meeting for seven days, until the day that the period of your ordination is fulfilled; for he will ordain you through seven days.

The Lord has commanded us to do as has been done this day, to make atonement on your behalf.

At the doorway of the tent of meeting, moreover, you shall remain day and night for seven days and fulfill your duty to the Lord, so that you will not die; for so I have been commanded.”