The Jewish Legal System: Laws of Damages: Self-Mutilation:
What is the Jewish view on self-mutilation?
There is a difference of opinion in the Talmud (Bava Kama 91a) as to whether deliberate self-injury is
permitted, but the accepted view is that it is
forbidden. This can be derived from Gen.9:5 and from
Deut.4:9. See also Rambam, Chovel u-Mazik 5:1, and Choshen Mishpat 420:31.
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