15 as to the flesh of the sacrifice of the thank-offering of his peace-offerings, in the day of his offering it is eaten; he doth not leave of it till morning. 16 'And if the sacrifice of his offering 'is' a vow or free-will offering, in the day of his bringing near his sacrifice it is eaten; and on the morrow also the remnant of it is eaten; 17 and the remnant of the flesh of the sacrifice on the third day with fire is burnt; 18 and if any of the flesh of the sacrifice of his peace-offerings be really eaten on the third day, it is not pleasing; for him who is bringing it near it is not reckoned; it is an abominable thing, and the person who is eating of it his iniquity doth bear.
Matthew Henry's Commentary on Leviticus 7:15-18
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.