Hadith #4125The Book of Fighting [The Prohibition of Bloodshed] · Narrated by ibn Umar, Muhammad bin Ja'far bin Abi Kathir محمد بن جعفر بن أبي كثير, Muhammad bin Zayd bin 'Abdullah محمد بن زيد بن عبد الله بن عمر, Shu'bah bin al-Hajjaj شعبة بن الحجاج, Waqid bin Muhammad bin Zayd واقد بن محمد بن زيد بن عبد الله
“The Messenger of Allah 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.'”