A man came to Allah's Apostle 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 about (for grazing) tied in a long rope."
Allah's Apostle said, "I have been sent with the shortest expressions bearing the widest meanings, and I have been made victorious with terror (cast in the hearts of the enemy), and while I was sleeping, the keys of the treasures of the world were brought to me and put in my hand." Abu Huraira added: Allah's Apostle has left the world and now you, people, are bringing out those treasures (i.e. the Prophet did not benefit by them).