Narrated Abu Musa: A man came to the Prophet (sallallahu ‘alaihi wa sallam) and asked, "O Allah's Messenger (sallallahu ‘alaihi wa sallam)! What kind of fighting is in Allah's cause? (I ask this), for some of us fight because of being enraged and angry and some for the sake of his pride and haughtiness." The Prophet (sallallahu ‘alaihi wa sallam) raised his head (as the questioner was standing) and said, "He who fights so that Allah's Word (Islam) should be superior, then he fights in Allah's cause."