Mishkat al-Masabih
Mishkat al-Masabih 3538
وَعَنْ أَبِي بَكْرَةَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «إِذَا الْتَقَى الْمُسْلِمَانِ حَمَلَ أَحَدُهُمَا عَلَى أَخِيهِ السِّلَاحَ فَهُمَا فِي جُرُفِ جَهَنَّمَ فَإِذَا قَتَلَ أَحَدُهُمَا صَاحِبَهُ دَخَلَاهَا جَمِيعًا» . وَفِي رِوَايَةٍ عَنْهُ: قَالَ: «إِذَا الْتَقَى الْمُسْلِمَانِ بسيفهما فَالْقَاتِلُ وَالْمَقْتُولُ فِي النَّارِ» قُلْتُ: هَذَا الْقَاتِلُ فَمَا بَالُ الْمَقْتُولِ؟ قَالَ: «إِنَّهُ كَانَ حَرِيصًا عَلَى قَتْلِ صَاحِبِهِ»
Abu Bakrah reported from the Prophet that he said: ‘When two Muslims meet and one of them bears arms against his brother, both are on the brink of Hell. If one kills the other, they both enter it.’ Another version from him says: ‘When two Muslims meet with their swords, both the killer and the one killed are in the Fire.’ I asked, ‘This one is the killer; what about the one killed?’ He said: ‘He was eager to kill his companion.’
Translation notes
The English witness adds Bukhari and Muslim as attribution; the Arabic passage supplied contains no source attribution.