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Eruvin 12

ERUVIN 11-15 sponsored by a generous grant from an anonymous donor. Kollel Iyun Hadaf is indebted to him for his encouragement and support and prays that Hashem will repay him in kind.


OPINIONS: Rav Nachman states that the only type of Mavoy which can be permitted by a Lechi or Korah is a Mavoy into which houses and Chatzeros open. The MISHNAH BERURAH (363:102), citing the Beis Yosef in the name of the Rashba, explains that the reason is because in order to permit carrying in a Mavoy with a diminutive Lechi or Korah, the Rabanan required that it be an area which is used by many people, who will point out to each other the Lechi or Korah. That is why an adjustment as small as a Lechi or Korah suffices to permit carrying in it. A Chatzer, though, which is not used by as many people, requires a larger adjustment (a Pas at least four Tefachim wide, or two Lechayayim) in order to permit carrying in it. (See also Tosfos DH u'Vatim)

How many houses must open to the Chatzeros in order to constitute a Mavoy that can be permitted with a Lechi or Korah?

(a) The RAMBAM (Hilchos Shabbos 17:8) writes that a Mavoy is not permitted with a Lechi if it "only has one house *or* one Chatzer." The Rashba infers from these words that the Rambam maintains that even *one Chatzer with one house* suffices. This is the opinion of Shmuel later in the Masechta (Eruvin 72b). However, this is contrary to the opinion cited as the Halachah in our Sugya, and even Shmuel might agree to this opinion according to the conclusion of the Gemara later (72b).

(b) RASHI (DH u'Vatim v'Chatzeros) says that there must be *two Chatzeros* each with at least *one house opening into each*. This is also the opinion of the RA'AVAD quoted by the Rashba.

(c) The RASHBA strongly disagrees and requires each of the *two Chatzeros* to have *two houses* open into it. This is also what RASHI says elsewhere (Shabbos 130b, Eruvin 74a), and this is the opinion of most of the Rishonim.

HALACHAH: The SHULCHAN ARUCH (OC 363:26) rules in accordance with the Rashba and most Rishonim, that a Mavoy requires two houses in each of two Chatzeros.
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