Pesachim 73 - February 2, 20 Shvat

Study Guide Pesachim 73 Some of the cases in the mishna seem quite obvious, so why are they there? If one holds that one who injures in a destructive manner on Shabbat is exempt, why in the mishna is one liable for slaughtering the animal when the sacrifice became disqualified - the slaughter was purely destructive. This question is asked on three case sin the mishna and on a case brought in a braita. The gemara explains in each case what about each case was constructive. The gemara brings a statement of Rav regarding a guilt offering whose owners died or received atonement from a different animal in its stead and it is left to graze. If someone slaughters it without any particular intent it counts as a burnt offering - this implies that a sacrifice can be uprooted automatically and can default to a different sacrifice without intent. This should apply also to a Pesach whose owners left the animal or became impure or died. If so, this contradicts a braita on our mishna that says one must burn it immediately if it was slaughtered - that implies it was a Pesach that was disqualified and it didn't default automatically to a peace offering. The gemara bring 5 attempts to resolve the contradiction and all are rejected except for one.