Shabbat 81: Bathroom Etiquette (and Shabbat)
How heavy is the rock you throw at a bird? What's the amount that makes a rock a problem to carry on Shabbat? It can't be muktzah, because it has essential use. Namely, bathroom etiquette involved setting aside rocks and leaves and more as functional toilet paper in a world that didn't have indoor plumbing. Plus: Kavod ha-briot, in its essential form.
The skinny
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