´It was narrated that Jundab bin 'Abdullah said:` "The Messenger of Allah [SAW] said: 'Whoever fights for a cause that is not clear, advocating tribalism, getting angry for the sake of tribalism, then he has died a death of Jahiliyyah.'"
Hadith ReferenceSunan an-Nasa'i / The Book Of Fighting (The Prohibition Of Bloodshed) / Hadith: 4120
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم