"I heard the Messenger of Allah say: 'If two Muslims confront each other with their swords and one of them kills the other, both the killer and the slain will be in Hell.'" They 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 157
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Sunan an-Nasa'i Book 37, Hadith 156 Next Hadith → "The Messenger of Allah said: 'If two Muslims fight with swords, and one of them kills the other, then the killer and the slain will both be in Hell.'"

Sunan an-Nasa'i Book 37, Hadith 158