Musnad Ahmad Hadith 7944

It is narrated from Abu Huraira (may Allah be pleased with him) that the Noble Prophet (ﷺ) said: Whoever withdraws from obedience to the leader and separates from the community and dies in that state, his death is a death of ignorance. And whoever fights under a banner without purpose (on the basis of national or linguistic prejudice), expresses anger for it, fights for it, and helps for it, and is killed, then his death is also like the death of ignorance. And whoever rebels against my Ummah, killing the righteous and the wicked alike, does not show regard for a believer, and does not fulfill the covenant with those with whom he has a covenant, then he has nothing to do with me and I have nothing to do with him.