أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ قَالَ حَدَّثَنَا جَرِيرٌ عَنْ مَنْصُورٍ عَنْ أَبِي وَائِلٍ قَالَ قَالَ عَبْدُ اللَّهِ سِبَابُ الْمُسْلِمِ فُسُوقٌ وَقِتَالُهُ کُفْرٌ
سنن نسائی · Hadith 4127
It was narrated that Ab Wa’il said: “Abdullah said: ‘DefAming a Muslim is evildoing and fighting him is Kufr.” (Sahih).
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020