(Mishnah): One who separates a female, or a male animal in its second year as his Korban Pesach (it is invalid and) it must graze until it receives a blemish and then be sold and its money used as a voluntary Korban.

One who separates his Korban Pesach and then dies, his son should not bring it as a Korban Pesach in place of him; rather, it should be brought as a Shelamim.

(Gemara): The Mishnah (about separating a female etc.) is referring to when it exists after the time of the sacrifice of the Korban Pesach, and it follows R. Shimon of the Beraisa -

If he separated it before Pesach, it should graze until it receives a blemish and then sold and the money used for a Korban Pesach.

If it was after Pesach, it should graze etc. and the money used for a Korban Shelamim.

R. Shimon says - before Pesach, he should sell it unblemished; after Pesach, it should come as a Shelamim.

Question: (The Mishnah taught that one who separates his Korban Pesach and then dies, his son should not bring it as a Korban Pesach in place of him; rather, it should be brought as a Shelamim.) Why is it that it should be brought as a Shelamim even if he died on the 14th - it was already fitting to be used and then rejected?

Answer: The Mishnah is discussing when he separated the money and it is teaching that he should not use that money for a Pesach but rather, it should be used to purchase a Shelamim.

(Mishnah): If a Pesach became mixed with other sacrifices, they must all graze until they receive a blemish and then be sold and the value of the most expensive one should used to give each type of sacrifice, and the extra cost should come from the money of the owner.

If it became mixed up only with firstborn animals - R. Shimon says that if it is a group of Kohanim, they may eat it.

(Gemara - Beraisa): One may not buy Shevi'is produce with Maaser Sheni money (lest the time of Bi'ur arrives and he will be required to destroy the remaining produce - which is prohibited to do with Shevi'is produce).

R.Yosa: This law is a dispute, like the Mishnah in Maaser Sheni where there is a dispute between R. Shimon and Rabbanan about buying Terumah with Maaser Sheni money.

R. Yona: Even R. Shimon, who said there that we are not concerned about the Terumah being wasted (as the Kohanim are careful), is concerned in the case of Shevi'is and will agree with the Rabbanan that one may not buy Shevi'is produce with Maaser Sheni money.

Question (R. Chananya to R. Mana - Mishnah): "If the Pesach became mixed with firstborn animals, R. Shimon says that if it is a group of Kohanim, they may eat it''. And the Beraisa teaches that they must eat it according to the requirements of the strictest Korban?

Answer: Those who eat the Korban Pesach are zealous like the Kohanim who eat Terumah.

Proof (Mishnah): "One may not roast meat, onion or egg (on a Friday afternoon) unless it will be roasted before Shabbos.'' On the other hand, the Mishnah teaches that "they lower the Korban Pesach into the oven just before nightfall''. (The resolution is that those that bring the Korban Pesach are zealous and there is no concern that they might stoke the fire on Shabbos.)

(Mishnah): If a group lost their Korban Pesach and they told one member of the group to go and find it and slaughter it for them; if he went and found it and slaughtered it and they acquired a new animal and slaughtered it -

If his was slaughtered first, he eats from it and they all eat with him. If theirs was slaughtered first, he eats from his and they eat from theirs.

If it is not known which one was slaughtered first or if they were slaughtered at the same time, he eats from his Korban but they do not eat with him and their animal is taken out to be burned; furthermore, they are exempt from Pesach Sheni.

If he said to them - if I am delayed, go out and slaughter for me - if he went and found the lost animal and slaughtered it and they acquired an animal and slaughtered it; if theirs was slaughtered first, they eat from theirs and he eats with them; if his was slaughtered first, he eats from his and they eat from theirs.

If it is not known which one was slaughtered first or if they were slaughtered at the same time, they eat from theirs but he does not eat with them; his animal is taken out to be burned and he is exempt from Pesach Sheni.

If both he said it to them and they said it to him, all eat from the first one slaughtered. If it is not known which one was slaughtered first, they are both taken out to be burned.

If neither he said it to them nor they said it to him, they are not responsible for each other (i.e. he eats from his and they eat from theirs).

If the Korbanos Pesach of two groups became mixed up -

Each group takes an animal and then one person from each group goes to the other group and declares -

If this Pesach is ours, your hands are withdrawn from yours and appointed on ours; if this Pesach is yours, our hands are withdrawn from ours and appointed on yours.

And similarly when there are five groups of five people or ten people, each group takes an animal and makes that declaration.

(Gemara - R. Yochanan): This Mishnah is the opinion of R. Noson, who said that one can fulfill his obligation through the throwing of the blood, even without eating. (This is clear from the words of the Mishnah - "it is taken out to be burned and they are exempt from Pesach Sheni''.)

(Beraisa - Bar Kafra): Silence is good for the wise and certainly for the fools (as in the Mishnah, if neither he nor they would have spoken, each could have eaten from their own Korban). And so says King Shlomo (Mishlei 17, 28), "Even a fool who is silent will be considered wise'' - and certainly a wise man who is silent.