prepared by Rabbi Eliezer Chrysler of Kollel Iyun Hadaf
Rosh Kollel: Rabbi Mordecai Kornfeld
(a) What does Abaye say about a space of three Tefachim in the Sechach of a large Sukah, part of which one filled in with canes or with metal spit-rods?
(b) Why is that?
(c) What will be the Din if he filled in the same gap, but in a small Sukah ...
1. ... with canes? Why is that?
2. ... with metal spit-rods?
(d) Why the difference?
(a) The above ruling is said with regard to a gap running along the side of the Sukah. Rav Acha and Ravina argue over whether the same Din applies to a gap running across the middle of the Sukah. On what grounds does one of them invalidate the Sukah, even if one filled in part of the gap with canes?
(b) Ravina (who is traditionally the lenient one whenever he and Rav Acha argue) bases his opinion on a Beraisa which discusses a beam that comes out of one wall but that does not reach the opposite one. In which connection is this Halachah learned?
(c) The Mishnah adds a case where two beams come out of two opposite walls but do not meet in the middle. What does the Tana rule in both cases?
(d) How does Rav Acha refute Ravina's proof from there that Lavud applies in the middle just as it does by the side?
(a) The Mishnah in Ohalos discusses the status of Kelim that are in a room containing a skylight if there is a Mes in the room. Assuming that the skylight measures a square Tefach, what will be the status of objects ...
1. ... in the room?
2. ... directly underneath the skylight?
3. ... that are in the room, if the piece of corpse is directly underneath the skylight?
(b) What is Rav Acha try to prove from there?
(c) How does Ravina refute the proof from here that Lavud does not apply in the middle of a wall or ceiling?
(d) Why can we not extend it to other areas of Halachah with a 'Binyan Av'?
(a) What did Rebbi Yehudah b'Rebbi Ila'i say about ...
1. ... a room part of whose ceiling caved in, and on which one placed Sechach?
2. ... a type of small fish called Abruma?
(b) What did Rebbi Yishmael b'Rebbi Yosi instruct Rebbi Yehudah to do in both cases?
(c) Why was that? What did his father say about ...
1. ... the case of the Sukah?
2. ... Abruma? What was the problem with these fish?
(d) Why did Rebbi Yosi then permit those that were caught in certain rivers?
(a) Similarly, Abaye permitted a type of small fish called Tzachnasa from the River Bav. Why did we initially think that Tzachnasa was permitted due to the fact that ...
1. ... it is a fast-flowing river?
2. ... its water is salty?
(b) On what grounds do we refute these suggestions?
(c) Why then, did Abaye in fact permit Tzachnasa?
(d) What is the significance of Ravina's statement that the rivers Eisan and Gamda were subsequently diverted into the Bav River?
(a) We learned that placing Sechach on top of an Achsadra (a sun-porch) that has posts that are placed at constitutes a Kasher Sukah. What sort of sun porch are talking about? What is the case?
(b) On what condition do the posts render the Sukah Kasher?
(c) Why are the posts necessary? What is wrong with the walls that surround the covered part of the sun-porch?
(a) Abaye validates it even if there are no posts. What does Rava say?
(b) What is the basis of their Machlokes?
(c) Rava asked Abaye why, in that case, he does not also validate a three-walled Sukah whose middle wall has collapsed, and which has Sechach consisting of thick planks that are less than four Tefachim wide. What did he reply? Why does he concede that 'Pi Tikrah Yored v'Sosem' does not apply there?
(a) We try to connect the Machlokes between Abaye and Rava with that of Rav and Shmuel, who argue by Achsadra b'Bik'ah. What is 'Achsadra b'Bik'ah'?
(b) What is the status of a Bik'ah regarding Shabbos?
(c) On what grounds does ...
1. ... Rav permit carrying inside the Achsadra on Shabbos, even more than four Amos?
2. ... Shmuel disagree? How can he argue with 'Pi Tikra Yored v'Sosem', which is Halachah l'Moshe mi'Sinai?
(d) What suggestion do we now make with regard to the Machlokes between Abaye and Rava?
(a) We conclude that Abaye and Rava do not argue over Shmuel's ruling. What does this mean?
(b) Then what are they arguing about?
(c) On what grounds does Rava establish Rav like him? What is the difference between Achsadra b'Bik'ah and Achsadra by Sukah?
(d) What major principle is 'Pi Tikra Yored v'Sosem a branch of?