John Calvin Commentary Leviticus 8:31

"And Moses said unto Aaron and to his sons, Boil the flesh at the door of the tent of meeting: and there eat it and the bread that is in the basket of consecration, as I commanded, saying, Aaron and his sons shall eat it." — Leviticus 8:31 (ASV)

And Moses said unto Aaron and his sons, Boil the flesh This is the universal rule, as we have seen elsewhere.⁴¹¹ One thing only is special, that God kept them in the tabernacle seven days, that they might learn to subordinate all their domestic cares and worldly business to their sacred duties. It has been elsewhere said, also,⁴¹² that perfection is denoted by the number seven, which this passage confirms, for by the seven days they were reminded that they were no longer their own masters for the rest of their life.

⁴¹¹ See ante, vol. 2, p. 133..

⁴¹² Ibid., p.26..