Leviticus 7:16-18

16But if the sacrifice of his oblation be a vow, or a freewill-offering, it shall be eaten on the day that he offereth his sacrifice; and on the morrow that which remaineth of it shall be eaten: 17but that which remaineth of the flesh of the sacrifice on the third day shall be burnt with fire. 18And if any of the flesh of the sacrifice of his peace-offerings be eaten on the third day, it shall not be accepted, neither shall it be imputed unto him that offereth it: it shall be an abomination, and the soul that eateth of it shall bear his iniquity.