Monday, September 23, 2019

halacha - What practices are affected by a belief in demons?


Inspired by R' Slifkin's new monograph, Wrestling with Demons, and acknowledging the fact that the existence of sheidim and other things magical in nature is an age-old dispute, I am wondering about the following question:



What halachic and/or customary practices would be affected by one's belief in demons? That is: I am looking for examples of halachos or minhagim that people observe that are dependent on the literal existence of sheidim, such that if one denied their existence, these laws/customs would be irrelevant.



Answer



Some people are careful to spill off a little bit of water (and other liquids?) before drinking, a practice explained in the Gemara (Chullin 105b, bottom) as due to concern that a shed may have drunk from it. However, most people don't worry about it.


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