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1. The bones, sinews, and leftover meat of the Korban Pesach are burned on the sixteenth of Nisan.
2. If the sixteenth of Nisan would fall on Shabbos,, they would burn these items (#1) on the seventeenth of Nisan.
3. There is a dispute about whether one transgresses the prohibition against breaking a bone when he does so to an invalid Korban Pesach.
4. There is a dispute about whether the prohibition of Gid ha'Nasheh applies to both thighs of the animal.
5. When the Mishnah mentions the sinew of the Korban Pesach, it refers to the fat of its Gid ha'Nasheh.
A BIT MORE
1. The bones refer to bones that contain marrow. Since it is forbidden to break the bones of the Korban Pesach, the marrow is like meat inside of the bones that would be burned together with any leftover meat of the Korban.
2. This is because burning these things does not override Shabbos or Yom Tov.
3. While everyone agrees that there is no such prohibition if the meat of the Korban was never permitted to be eaten, there is a dispute about whether it applies to a Korban Pesach that was permitted to be eaten before it became invalid. The Tana Kama says that it does not apply, while Rebbi Yakov says that it does.
4. While the primary opinion is that the prohibition does apply to both sides, Rebbi Yehudah understands that it applies only to the Gid ha'Nasheh in the right thigh of the animal.
5. Although one is permitted to eat the fat, Rav Ashi says that the custom was not to eat it (and it therefore was left to become Nosar).
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