Abu Musa Al-Ash'ari (RAA) narrated that The Messenger of Allah (ﷺ) said:
"The one who fights for Allah's word to become Superior, is striving in Allah's Cause." Agreed upon. (JA)
English reference (JA): Book 11, Hadith 1305 (JA)
Arabic reference (JA): Book 11, Hadith 1278 (JA)