The Messenger of Allah said: "If two Muslims confront each other with swords and one of them kills the other, then the killer and the slain will both be in Hell." A man said: "O Messenger of Allah, (we understand about) the killer, but what about the one who is killed?" He said: "He wanted to kill his companion."
Sunan an-Nasa'i Book 37, Hadith 159
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Sunan an-Nasa'i Book 37, Hadith 158 Next Hadith → The Prophet said: "Do not revert to disbelievers after I am gone, striking the necks of one another (killing one another)."

Sunan an-Nasa'i Book 37, Hadith 160