It shall be eaten on the day you sacrifice it, or on the next day; but what remains on the third day must be burned up.
Moses is ordered to deliver the summary of the laws to all the congregation of the children of Israel (Lev 19:2); not to Aaron and his sons only, but to all the people, for they were all concerned to know their duty. Even in the darker ages of the law, that religion could not be of God which boasted of ignorance as its mother.
Commenting on Leviticus 19:1-10
It shall be eaten the same day ye offer it, and on the morrow,.... The meaning is, that if it could be, it was best to eat it all up the same day it was offered, but if not, the remainder was to be eaten on the morrow, but by no means to be kept any longer; this shows that that sort of peace offering...
Lev 19:5-8 True fidelity to Jehovah was to be shown, so far as sacrifice, the leading form of divine worship, was concerned, in the fact, that the holiness of the sacrificial flesh was strictly preserved in the sacrificial meals, and none of the flesh of the peace-offerings eaten on the third day. To this end the command in Lev 7:15-18 is emphatically repeated, and transgressors are threatened with extermination.
Commenting on Leviticus 19:5-8