(mishnah): Bones, sinews and Nosar are burned on the 16th.

If the 16th occurs on Shabbos, they are burned on the 17th, since they do not override Shabbos or Yom Tov.

(gemara): A bone without flesh -

R. Yochanan said that it may not be broken.

R''SBL said that it may be broken.

Question (r. Yochanan to R''SBL - Beraisa): 'Bones, sinews and Nosar are burned on the 16th'. Why not cut them off?

Answer: Because of the marrow inside the thigh-bone which became Nosar.

Question: Why not break open the bone and remove the marrow; the bone will then be permitted?

Answer: One may not break a bone even if it is disqualified.

Answer #2 (r. Elazar): One could even say that breaking such a bone is permitted - it follows R. Yaakov who said that if it was originally valid and became Tameh, one may not break its bone.

R. Imi quoting R. Elazar: Why did they say that bones, sinews and Nosar are burned on the 16th (rather than on the 14th)? As burning is considered breaking a bone.

Shmuel said: The group may be designated on only the brain (moach) of the animal but they may not be designated on the marrow (moach) of its thigh-bone. Its brain is acceptable since it can be removed through its ear; its thigh-bone marrow is not acceptable since it can only be remove by breaking the bone (which is prohibited).

R. Yochanan said: A group may be designated on the marrow of the thigh-bone. R. Yaakov bar Acha quoting R. Yochanan prohibited it, but if it was done, it is valid.

Question: According to R. Yochanan, burning a bone is not like breaking it - so why can he not then burn it?

Answer: Because of the loss of Kodshim (so it is preferable that it becomes disqualified by itself).

Question: According to Shmuel, after it becomes Nosar, let him burn it and benefit from the bone?

Answer: Shmuel holds the view of R. Yaakov that if it was originally valid and became Tameh, one may not break its bone.

Question: Why burn it on the 16th?

Answer: The Pasuk states (shemos 12, 10), "You shall not leave from it until the morning and one who leaves it over shall burn it in the morning'' - the Pasuk refers to two mornings - the morning of the 15th and the 16th, meaning burn it on the morning of the 16th. (Note: This explanation follows a corrected text based on the same statement in Yerushalmi Tractate Shabbos 2:1.)

Similarly: The Pasuk states about a Shelamim offering (vayikra 7, 17), "And the Nosar from the flesh of the sacrifice shall be burned in fire on the third day.''

Query: May we ignite a fire of Chametz (before Yom Tov for it to continue to burn on Yom Tov)?

Answer: The one who learned (the burning of Chametz) from Nosar will prohibit it; the one who did not learn from Nosar will permit it.

R. Bun bar Chiya: They adopted the opinion of R. Yishmael, who said there that a baby whose circumcision was not performed on time may be circumcised at any time, day or night. Similarly, once the prescribed time-limit of the sacrifice has passed, it must be burned, day or night.