Leviticus 7:15

And the flesh of the sacrifice. — That is, after the priest had the breast and the shoulder, the share of the victim which belongs to the offerer, together with the remaining loaves, he with his family and poor guests (see Deuteronomy 12:11) are to eat up before the morning, which at the time of the second Temple was limited to midnight. This limitation of time was designed both to encourage liberality to the poor, and to impress upon those who partook of it that it was a sacrificial and sacred feast, so as to prevent its being turned into unseemly conviviality.