(5) باب فِي النَّهْىِ عَنِ الْقِتَالِ، فِي الْفِتْنَةِ
Ahnaf b. Qais said:
I came out with the intention of (participating in) fighting. Abu Bakrah met me and said: Go back, for I heard the Messenger of Allah (ﷺ) say: When two Muslims face each other with their swords, the killer and the slain will go to Hell. He asked: Messenger of Allah, this is the killer (so naturally he should go to Hell), but what is the matter with the slain ? He replied: He intended to kill his companion.
Reference: Sunan Abi Dawud 4268
In-book reference: Book 37, Hadith 29
English translation: Book 36, Hadith 4255