Sunan an-Nasa'i #4117 · The Book of Fighting [The Prohibition of Bloodshed]

Sunan an-Nasa'iIt was narrated that Abu Bakrah said
Sunan an-Nasa'i · Book 37 · The Book of Fighting [The Prohibition of Bloodshed]
Sunan an-Nasa'i · كتاب 37 · كتاب القتال [تحريم سفك الدماء]
"If two Muslim men bear weapons against each other, then they are both on the brink of Hell. And if one of them kills the other, they will both be in Hell
أَخْبَرَنَا أَحْمَدُ بْنُ سُلَيْمَانَ، قَالَ حَدَّثَنَا يَعْلَى، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ مَنْصُورٍ، عَنْ رِبْعِيٍّ، عَنْ أَبِي بَكْرَةَ، قَالَ إِذَا حَمَلَ الرَّجُلاَنِ الْمُسْلِمَانِ السِّلاَحَ أَحَدُهُمَا عَلَى الآخَرِ فَهُمَا عَلَى جُرُفِ جَهَنَّمَ فَإِذَا قَتَلَ أَحَدُهُمَا الآخَرَ فَهُمَا فِي النَّارِ ‏.‏
Reference : Sunan an-Nasa'i 4117In-book reference : Book 37, Hadith 152