Sunan An-Nasa'i

It was narrated from Abu Bakrah that :The Prophet [SAW] said: ""If two Muslims confront each other with swords, each of them wanting to kill the other, they will both be in Hell."" It was said to him: ""O Messenger of Allah, (we understand about) the killer, but what about the one who is killed?"" He said: ""He was determined to kill his companion