Language:
كتاب الجهاد والسير
56
Fighting for the Cause of Allah (Jihaad)
(128)
Chapter: Holding the riding animal of somebody else
(128)
باب مَنْ أَخَذَ بِالرِّكَابِ وَنَحْوِهِ

Narrated Abu Huraira:

Allah's Messenger (ﷺ) said, "There is a (compulsory) Sadaqa (charity) to be given for every joint of the human body (as a sign of gratitude to Allah) everyday the sun rises. To judge justly between two persons is regarded as Sadaqa, and to help a man concerning his riding animal by helping him to ride it or by lifting his luggage on to it, is also regarded as Sadaqa, and (saying) a good word is also Sadaqa, and every step taken on one's way to offer the compulsory prayer (in the mosque) is also Sadaqa and to remove a harmful thing from the way is also Sadaqa."

حَدَّثَنِي 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 الاِثْنَيْنِ صَدَقَةٌ، وَيُعِينُ الرَّجُلَ عَلَى دَابَّتِهِ، فَيَحْمِلُ عَلَيْهَا، أَوْ يَرْفَعُ عَلَيْهَا مَتَاعَهُ صَدَقَةٌ، وَالْكَلِمَةُ الطَّيِّبَةُ صَدَقَةٌ، وَكُلُّ خَطْوَةٍ يَخْطُوهَا إِلَى الصَّلاَةِ صَدَقَةٌ، وَيُمِيطُ الأَذَى عَنِ الطَّرِيقِ صَدَقَةٌ ‏"‏‏.‏
Reference : Sahih al-Bukhari 2989
In-book reference : Book 56, Hadith 198
USC-MSA web (English) reference : Vol. 4, Book 52, Hadith 232
  (deprecated numbering scheme)