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In your question you assume there was an eruv in Yerushalayim, and therefore find it difficult to understand why they would not carry the Korban Pesach home until night, and why they would bring the 4 minim before Shabbos. However, it is clear from the Gemara Eruvin 101a that no eruv was made in the streets of Yerushalayim. Rav Moshe Feinstein [in Igros ...


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Update: I got a response from a rabbi affiliated with the OU, he runs an "ask the rabbi" type service. The CPL ID card is not muksah if it is legally required to carry the gun.


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The takanah of Rabbi Yochanan ben Zakai was made as a lo plug, no differentiation whether there was an eruv or not. Also, it is not just a matter of carrying with no eruv.this is discussed in Not Shaking the Lulav on Shabbat. As Rashi explains, if communities with an eruv start bringing the lulav to shul, they would be violating the takanah of Rabbi Yochanan ...


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An eruv is no better than one's own house. When Rav Yochanan ben Zakkai made the takana, he could have made it that everyone should take the lulav in their house before coming to shul. But we see that he was concerned that there might be one person who needed help, and would thus leave his house to ask for help in a forbidden way. It's a far-fetched concern,...


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