Sunan an-Nasa'i
Sunan an-Nasa'i 4112
Fighting Muslims
Arabic hadith text
أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ أَبِي وَائِلٍ، قَالَ قَالَ عَبْدُ اللَّهِسِبَابُ الْمُسْلِمِ فُسُوقٌ وَقِتَالُهُ كُفْرٌ .
Translation
It was narrated that Abu Wa'il said
"'Abdullah said: 'Defaming a Muslim is evildoing and fighting him is Kufr.'"