Hadith
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا مُحَمَّدُ بْنُ الْحَسَنِ الأَسَدِيُّ، حَدَّثَنَا أَبُو هِلاَلٍ، عَنِ ابْنِ سِيرِينَ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ ـ صلى الله عليه وسلم ـ قَالَ " سِبَابُ الْمُسْلِمِ فُسُوقٌ وَقِتَالُهُ كُفْرٌ " .
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It was narrated from Abu Hurairah that the Prophet (ﷺ) said:“Verbally abusing a Muslim is Fusuq (disobedience) and fighting him is Kufr (ungratefulness to Allah).”
Sahih · Al-Albani
Sunan Ibn Majah 3940 ·Book 36, Hadith 15·Also available on sunnah.com·