Sahih Al Bukhari – Book of Oppressions
Volumn 003, Book 043, Hadith Number 654.
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Narated By 'Abdullah bin Yazid Al-Ansari RA : The Prophet PBUH forbade robbery (taking away what belongs to others without their permission), and also forbade mutilation (or maiming) of bodies.
Mutilation or maiming is an act of physical injury that degrades the appearance or function of any living body, usually causing death
Junaid Tahir