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Summary
Mishna: If one supports schach with his bedposts, it is kosher.
Rabbi Yehuda: If it cannot stand without the posts [it is supported only by bedposts], it is possul.
Gemara:
Question: What is Rabbi Yehuda’s reasoning?
Answer: Rabbi Zeira and Rabbi Abba bar Mammal:
One of them explained: Because it’s not a permanent dwelling [according to Rabbi Yehuda, a sukkah must be permanent; 6.2, 18.6].
One of them explained: Because it is supported by something that is mekabel tumah (just as the schach cannot be made from something that’s mekabel tumah [9.3], it cannot be supported by a mekabel tumah).
Question: What is the difference between the reasons?
Answer: If the schach would be held up by four iron rods.
According to the first reason, it would be kosher, since the rods are not portable.
According to the second reason, it would be possul, since the rods are mekabel tumah.
(This all according to Rabbi Yehuda. According to the Chachomim a sukkah must not be permanent and it may be supported by something that’s mekabel tumah).
Abayye: If the schach is over the bed [the walls are a part of the bed, but the schach is on posts over the bed] Rabbi Yehuda agrees that it is kosher.
Why? Because it’s permanent and not mekabel tumah [although the walls may be portable and mekabel tumah, the posts are not and we’re only concerned with the schach]. This podcast has been graciously sponsored by JewishPodcasts.fm. There is much overhead to maintain this service so please help us continue our goal of helping Jewish lecturers become podcasters and support us with a donation: https://thechesedfund.com/jewishpodcasts/donate