(22) بَابُ: {وَإِنْ طَائِفَتَانِ مِنَ الْمُؤْمِنِينَ اقْتَتَلُوا فَأَصْلِحُوا بَيْنَهُمَا} فَسَمَّاهُمُ الْمُؤْمِنِينَ
Narrated Al-Ahnaf bin Qais:
While I was going to help this man ('Ali Ibn Abi Talib), Abu Bakra metme and asked, "Where are you going?" I replied, "I am going to help that person." He said, "Go back for I have heard Allah's Messenger (ﷺ) saying, 'When two Muslims fight (meet) each other with their swords, both the murderer as well as the murdered will go to the Hell-fire.' Isaid, 'O Allah's Messenger (ﷺ)! It is all right for the murderer but what about the murdered one?' Allah's Messenger (ﷺ) replied, "He surely had the intention to kill his companion." (ES)
Reference (ES): Sahih al-Bukhari 31 (ES)
In-book reference (ES): Book 2, Hadith 24 (ES)
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 2, Hadith 31 (ES)