Takhrij Hadith 274: "I went out to support…"

I went out to support this man, and Abu Bakrah met me and said: ‘Where are you going?’ I replied: ‘I am going to support this man.’ He said: ‘Go back, for I heard the Messenger of Allah ﷺ say: “When two Muslims confront one another with their swords, both the killer and the one killed will be in the Fire.” I asked: “O Messenger of Allah, this is the killer, but what about the one who was killed?” He replied: “Indeed, he was eager to kill his companion.