This is a Hadith Quote

Narrated Abu Huraira

Allah’s Apostle (sallallahu alayhi wa salam) 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.”

{Volume 3, Book 49, Number 870: Sahih Bukhari}