Sahih Bukhari
Peacemaking
Volume: 003 / Book Number: 049 / Hadith Number: 870
Narrated Abu Huraira:
Allah's Apostle 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."