How does this Pasuk, which writes that the Pesach must eaten in one house, tally with the Pasuk earlier (12:7), which writes "Al ha'Batim asher Yochlu osam bahem", implying that one may move from one house to the other?
Rashi and Targum Yonasan: The Pasuk means that one must eat the Pesach (not in one's house, but) in one group (that one is not permitted to join another group whilst eating it (even in the same house). 1
Nor may one send a piece of one's Pesach as a gift to somebody in another group (Targum Yonasan).
What is the scope of the prohibition against breaking the bone of a Korban Pesach?
Rashi: It is confined to a bone that contains a k'Zayis of meat or of marrow. 1
Targum Yonasan: One may not break a bone in order to eat the marrow inside it.
Rashbam: One should not break a bone in the way that someone who eats in haste tends to do. 2
Rashi writes that it is Asur to break a bone of a Pesach only if it has a k'Zayis of meat. What is the reason?
Moshav Zekenim: Pesach should be eaten when satiated. If he already has a k'Zayis of meat on the bone, and he breaks it to eat the marrow, he shows that he is hungry, and transgresses. 1 If there is not a k'Zayis of meat on the bone, he breaks it to fulfill the Mitzvah of eating Pesach. 2
Rosh: We discuss one whose share of Pesach was a bone, with the meat on it and inside it. If he needs to break it in order to get a k'Zayis of meat and do the Mitzvah, it is permitted. 3 However, the Gemara connotes unlike this.
Moshav Zekenim: The Aseh to eat the meat should override the Lav to break a bone! Since the Lav was repeated regarding Pesach Sheni, it forbids whether or not there is a k'Zayis of meat. This should be an exclusion after an exclusion, which includes! R. Yeshayah - one fulfills the Aseh only after transgressing the Lav, therefore it is not Docheh. Zevachim 94a - an Aseh is not Docheh a Lav in Kodshim.
It should depend on whether or not he already ate a k'Zayis! Perhaps we judge now, when he breaks it, whether or not it is evident that he breaks it due to hunger. (PF)
Is this because Aseh Docheh Lo Sa'aseh? One fulfills the Aseh only after transgressing the Lav! Also an Aseh is not Docheh a Lav in Kodshim! Perhaps the Lav was not said in such a case. (PF)