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Pesachim Chart #17

Pesachim Daf 100a

EATING ON EREV SHABBOS AND ON EREV PESACH
  (A)
BEFORE 9TH HOUR 		(B)
FROM 9TH HOUR
UNTIL NIGHTFALL		 (C)
NIGHTFALL
REBBI YEHUDAH
1) EREV SHABBOS May start(1) May not start,
and if one did
he must stop(2)		 Must stop(3)
2) EREV PESACH May start(1) May not start,
and if one did
he must stop(2) 		Must stop(3)
REBBI YOSI
3) EREV SHABBOS May start(1) May start(4) Not required to
stop(5)
4) EREV PESACH May start(1) May not start(6),
and if one did
he must stop(7) 		Not required to
stop(8)
==========
FOOTNOTES:
==========
(1) If one started eating when it was permitted (before the ninth hour), he may continue eating until nightfall (RASHBAM 99b, DH Amar Lo Raban Shimon ben Gamliel, DH Mafsikin; 100b, DH Kan Kodem Tish'ah; TOSFOS 100a, DH Ein Mafsikin).
(2) That is, if one started eating when it was prohibited to do so (after the ninth hour), he must stop immediately, and he is not permitted to continue eating until nightfall (this seems to be the intent of RABEINU YECHIEL in TOSFOS DH Michlal; see Tosfos there and Gilyon ha'Shas; this also seems to be the opinion of the RASHBAM, loc. cit., who emphasizes that only if one began when it was *permitted* is he allowed to continue until nightfall).
(3) In this case, one must "remove his table" (and recite Birkaz ha'Mazon, Tosfos), recite Kiddush, and then return one's table (RASHBAM DH Amar Lo, according to the Sugya here -- however, it appears that according to Rav Hamnuna Saba (105a), Rebbi Yehudah requires only that one be "Pores Mapah" and make Kiddush, see Insights 105:1).
(4) This is the opinion of most Rishonim. However, the BEHAG (cited by TOSFOS DH Ein Mafsikin, and by the ROSH) explains that Rebbi Yosi agrees that l'Chatchilah one may *not* start eating, but if he did start eating, he is not required to stop but he may eat until nightfall. (This is in contrast to Rebbi Yehudah, who says that if he started to eat when he was not supposed to, he must stop, as mentioned above (2).) However, if he started to eat after the ninth hour on Erev Pesach, he must stop immediately.
(5) In this case, one does not even need to be "Pores Mapah" (spread a cloth over the meal) and make Kiddush. Rather, one may complete his meal and then recite Kiddush afterwards. The Halachah does not follow Rebbi Yosi's opinion in full; rather, one must be Pores Mapah and make Kiddush.
(6) However, according to the ROSH, who rules like the answer of Rav Papa (99b), Rebbi Yosi permits starting even on Erev Pesach after the ninth hour.
(7) So writes TOSFOS (DH Ein Mafsikin), that if one started to eat when it was prohibited, he must stop (immediately), and only when he started to eat before the ninth hour is he permitted to continue eating until nightfall. This also seems to be the view of the RASHBAM (DH Mafsikin, and DH Amar Lo Raban Shimon ben Gamliel). However, it seems from the words of RABEINU YECHIEL, cited by Tosfos (DH Michlal), that he is of the opinion that Rebbi Yosi does *not* require one to stop eating even if he started when it was prohibited (it seems that not only he does not have to stop immediately, even at nightfall he may continue, since we do not find any distinction between the two).
(8) That is, one does not even need to be "Pores Mapah," as above in (4). This applies, though, only if he started eating when it was permitted (before the ninth hour), as above in (7).

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