Sahih Muslim :Book 41, Number 6901:


Abu Bakra reported Allah's Messenger (may peace be upon him) 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.

Sahih Muslim :Book 41, Number 6902:


Abu Huraira reported Allah's Messenger (may peace be upon him) many ahadith and one of them was this: The last Hour will not come until the two parties (of Muslims) confront each other and there is a large-scale massacre amongst them and the claim of both of them is the same.