Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:19617a
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السيوطي:١٩٦١٧a

"مَا مِنْ مُسْلِمين الْتَقَيَا بأَسْيَافِهمَا إِلا كانَ الْقَاتِلُ وَالْمَقْتُولُ في النَّار".  

[هـ] ابن ماجة عن أَنس

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Collected by Ibn Mājah
ibnmajah:3963Sūwayd b. Saʿīd > Mubārak b. Suḥaym > ʿAbd al-ʿAzīz b. Ṣuhayb > Anas b. Mālik

“There are no two Muslims who confront one another with their swords, but both the killer and the slain will be in Hell.”  

ابن ماجة:٣٩٦٣حَدَّثَنَا سُوَيْدُ بْنُ سَعِيدٍ حَدَّثَنَا مُبَارَكُ بْنُ سُحَيْمٍ عَنْ عَبْدِ الْعَزِيزِ بْنِ صُهَيْبٍ عَنْ أَنَسِ بْنِ مَالِكٍ

عَنِ النَّبِيِّ ﷺ قَالَ مَا مِنْ مُسْلِمَيْنِ الْتَقَيَا بِأَسْيَافِهِمَا إِلاَّ كَانَ الْقَاتِلُ وَالْمَقْتُولُ فِي النَّارِ