Sahih Bukhari

Narrated Abu Musa Al-Ash`ari:A bedouin asked the Prophet, ""A man may fight for the sake of booty, and another may fight so that he may be mentioned by the people, and a third may fight to show his position (i.e. bravery); which of these is regarded as fighting in Allah's Cause?"" The Prophet (ﷺ) said, ""He who fights so that Allah's Word (i.e. Islam) should be superior, fights for Allah's Cause