Hadith
أَخْبَرَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، قَالَ حَدَّثَنَا الْخَلِيلُ بْنُ عُمَرَ بْنِ إِبْرَاهِيمَ، قَالَ حَدَّثَنِي أَبِي قَالَ، حَدَّثَنِي قَتَادَةُ، عَنِ الْحَسَنِ، عَنْ أَبِي بَكْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِذَا الْتَقَى الْمُسْلِمَانِ بِسَيْفَيْهِمَا فَقَتَلَ أَحَدُهُمَا صَاحِبَهُ فَالْقَاتِلُ وَالْمَقْتُولُ فِي النَّارِ " .
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It was narrated that Abu Bakrah said:"The Messenger [SAW] said: 'If two Muslims meet (and fight) with their swords and one of them kills the other, the killer and the slain will both be in Hell
Sahih · Abu Ghuddah
Sunan an-Nasa'i 4121 ·Book 37, Hadith 156·Also available on sunnah.com·