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Correction: We do not kasher an urn for Pesach. The large amount of water needed in the story of the Rebbe Rashab involved the kitchen in general. The Rebbetzin says that we should "מורא האבן פון דעם אונטערשטן" regarding the neighbor downstairs, and the Rebbe Rashab responded: "מען דארף מורא האבן פון דעם אויבערשטן"