15 And the flesh of the sacrifice of his peace-offerings for thanksgiving shall be eaten on the day of his oblation; he shall not leave any of it until the morning. 16 But 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: 17 but that which remaineth of the flesh of the sacrifice on the third day shall be burnt with fire. 18 And 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. 19 And the flesh that toucheth any unclean thing shall not be eaten; it shall be burnt with fire. And as for the flesh, every one that is clean shall eat thereof: 20 but the soul that eateth of the flesh of the sacrifice of peace-offerings, that pertain unto Jehovah, having his uncleanness upon him, that soul shall be cut off from his people. 21 And when any one shall touch any unclean thing, the uncleanness of man, or an unclean beast, or any unclean abomination, and eat of the flesh of the sacrifice of peace-offerings, which pertain unto Jehovah, that soul shall be cut off from his people.
Matthew Henry's Commentary on Leviticus 7:15-21
Commentary on Leviticus 7:11-27
(Read Leviticus 7:11-27)
As to the peace-offerings, in the expression of their sense of mercy, God left them more at liberty, than in the expression of their sense of sin; that their sacrifices, being free-will offerings, might be the more acceptable, while, by obliging them to bring the sacrifices of atonement, God shows the necessity of the great Propitiation. The main reason why blood was forbidden of old, was because the Lord had appointed blood for an atonement. This use, being figurative, had its end in Christ, who by his death and blood-shedding caused the sacrifices to cease. Therefore this law is not now in force on believers.