It was proper that the sacrificial meat should not be polluted by any approach to putrefaction. But the exclusion of a mean-spirited economy may further have furnished the ground for the distinction between the thank-offerings and the others. The most liberal distribution of the meat of the offering, particularly among the poor who were invited to partake, would plainly be becoming when the sacrifice was intended especially to express gratitude for mercies received.
Related Commentaries of Leviticus 7:18
Leviticus 7:18-19
18 And if any of the flesh of the sacrifice of his peace offerings be eaten at all 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.
19 And the flesh that toucheth any unclean thing shall not be eaten; it shall be burnt with fire: and as for the flesh, all that be clean shall eat thereof.