15 And the flesh of the sacrifice of his peace offerings for thanksgiving shall be eaten on the day of his offering; he shall not leave any of it until the morning. 16 But if the sacrifice of his offering is a votive offering or a freewill offering, it shall be eaten on the day that he offers his sacrifice, and on the morrow what remains of it shall be eaten, 17 but what remains of the flesh of the sacrifice on the third day shall be burned with fire. 18 If any of the flesh of the sacrifice of his peace offering is eaten on the third day, he who offers it shall not be accepted, neither shall it be credited to him; it shall be an abomination, and he who eats of it shall bear his iniquity. 19 "Flesh that touches any unclean thing shall not be eaten; it shall be burned with fire. All who are clean may eat flesh, 20 but the person who eats of the flesh of the sacrifice of the Lord's peace offerings while an uncleanness is on him, that person shall be cut off from his people. 21 And if any one touches an unclean thing, whether the uncleanness of man or an unclean beast or any unclean abomination, and then eats of the flesh of the sacrifice of the Lord's peace offerings, that person 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.