We went out with God’s Messenger on an expedition and when a man came upon a cave containing some water and vegetables he felt inclined to stay in it and withdraw from the world, so he asked God’s Messenger’s permission regarding that, but he replied, “I was not commissioned with Judaism, or Christianity, but with the easy Hanif religion. By Him in whose hand Muhammad's soul is, a morning or an evening expedition in God’s path is better than the world and what it contains, and for one of you to remain in the line of battle is better than his prayers for sixty years.”
‘Uqba b. Malik reported the Prophet as saying, “When I send out a man and he does not fulfil my command, are you unable to appoint in his place one who will fulfil my command?"
‘Ubada b. as-Samit reported God’s Messenger as saying, “He who fights in God’s path with no intention but getting a tethering rope will have what he intended.”*
* This saying advocates the necessity of having proper motives. If all one wants is some material gain that is all he will get, for he will not deserve any eternal reward.
'Abdallah b. ‘Amr told that he asked God’s Messenger to tell him about jihad and he replied, “If you fight with endurance, ‘Abdallah b. ‘Amr, seeking from God your reward, God will resurrect you showing endurance and seeking your reward from Him, but if you fight for vain show seeking to acquire much God will resurrect you making a vain show and seeking to acquire much. In whatever state you fight or are killed, ‘Abdallah b. ‘Amr, in that state God will resurrect you."