(1) باب فَضْلُ الْجِهَادِ وَالسِّيَرِ
Narrated Abu Huraira:
A man came to Allah's Messenger (ﷺ) and said, "Instruct me as to such a deed as equals Jihad (in reward)." He replied, "I do not find such a deed." Then he added, "Can you, while the Muslim fighter is in the battle-field, enter your mosque to perform prayers without cease and fast and never break your fast?" The man said, "But who can do that?" Abu- Huraira added, "The Mujahid (i.e. Muslim fighter) is rewarded even for the footsteps of his horse while it wanders bout (for grazing) tied in a long rope."
Reference: Sahih al-Bukhari 2785
In-book reference: Book 56, Hadith 4
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 52, Hadith 44