Sahih al-Bukhari, Hadith 2707 ⓘ
Narrated Abu Huraira: Allah's Messenger 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."
حَدَّثَنَا إِسْحَاقُ، أَخْبَرَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنْ هَمَّامٍ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " كُلُّ سُلاَمَى مِنَ النَّاسِ عَلَيْهِ صَدَقَةٌ، كُلَّ يَوْمٍ تَطْلُعُ فِيهِ الشَّمْسُ يَعْدِلُ بَيْنَ النَّاسِ صَدَقَةٌ " .
also referenced under: Book 53, Hadith 17 (In-Book) & Volume 3, Book 49, Hadith 870 (USC-MSA)