Is it permitted to make non-musical noise (e.g. knocking on a door) on Shabbat?
Synopsis
The Mechaber rules that producing sound from a musical instrument is forbidden, but non-musical knocking (e.g. on a door) is permitted. The Rif, Rambam, and Rosh all rule like Rava that only musical sound is forbidden, contra Ulla who forbids all sound production.
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Discussion
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