Leviticus 7:17-18

¹⁷But if any of the flesh of the offering is still unused on the third day, it is to be burned with fire.

¹⁸And if any of the flesh of the peace-offering is taken as food on the third day, it will not be pleasing to God and will not be put to the account of him who gives it; it will be unclean and a cause of sin to him who takes it as food.