الفتن وأشراط الساعة : Hadeeth No:6901
Abu Bakra reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: When two Muslims (confront each other) and the one amongst them attacks his brother with a weapon, both of them are at the brink of Hell-Fire. And when one of them kills his companion, both of them get into Hell-Fire....
الطلاق : Hadeeth No:3583
A hadith like this is reported on the authority of the same chain of transmitters but with a slight change of words....