Leviticus 19:5-8

5“ ‘When you sacrifice a fellowship offering to the Lord, sacrifice it in such a way that it will be accepted on your behalf. 6It shall be eaten on the day you sacrifice it or on the next day; anything left over until the third day must be burned up. 7If any of it is eaten on the third day, it is impure and will not be accepted. 8Whoever eats it will be held responsible because they have desecrated what is holy to the Lord; they must be cut off from their people.