Eruvin 79: Learning from the 3 Little Pigs
3 mishnayot on things that can come between courtyards and change the need for eruvin: 1. A ditch between two courtyards. The Gemara delves into the authority behind the mishnah's psak, and also attempts a comparison and then rejects it. 2. A haystack that is between 2 courtyards that is 10 tefachim high functions as a partition, until the livestock from either/both courtyards reduce it to lower than 10 tefachim high. 3. Establishing an eruv in an alleyway that runs by courtyards - how to do it? Use a barrel full of food and make it "everyone's." That gives them the common interest…
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