Sahih Bukhari

Narrated Abu Musa:A man came to the Prophet (ﷺ) and asked, ""A man fights for war booty; another fights for fame and a third fights for showing off; which of them fights in Allah's Cause?"" The Prophet (ﷺ) said, ""He who fights that Allah's Word (i.e. Islam) should be superior, fights in Allah's Cause