Hadith
أَخْبَرَنَا مَحْمُودُ بْنُ غَيْلاَنَ، قَالَ حَدَّثَنَا مُعَاوِيَةُ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ مَنْصُورٍ، عَنْ أَبِي وَائِلٍ، عَنْ عَبْدِ اللَّهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " سِبَابُ الْمُسْلِمِ فُسُوقٌ وَقِتَالُهُ كُفْرٌ " .
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It was narrated that 'Abdullah said:"The Messenger of Allah [SAW] said: 'Defaming a Muslim is evildoing and fighting him is Kufr
Sahih · Abu Ghuddah
Sunan an-Nasa'i 4111 ·Book 37, Hadith 146·Also available on sunnah.com·