Hadith #4125 (Sunan al-Nasa'i)
Book: The Book of Fighting [The Prohibition of Bloodshed]
Narrator(s): 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.'”

Source: https://parallelquran.com/hadith/sunan-al-nasai-4125/