Sahih Al Bukhari – Book of Peacemaking
Volumn 003, Book 049, Hadith Number 870.
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Narated By Abu Huraira RA: Allah's Apostle PBUH said, "There is a Sadaqa to be given for every joint of the human body; and for every day on which the sun rises there is a reward of a Sadaqa (i.e. charitable gift) for the one who establishes justice among people."