3994Ibn MajahSahih (Darussalam)حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا عِيسَى بْنُ يُونُسَ، حَدَّثَنَا الأَعْمَشُ، عَنْ شَقِيقٍ، عَنِ ابْنِ مَسْعُودٍ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ سِبَابُ الْمُسْلِمِ فُسُوقٌ وَقِتَالُهُ كُفْرٌ " It was narrated from Ibn Mas'ud that the Messenger of Allah (ﷺ) said:"Verbally abusing a Muslim is Fusuq disobedience and fighting him is Kufr (ungratefulness to Allah).'"Reference: Sunan Ibn Majah 3939 In-book : Book 36, Hadith 14 English translation : Vol. 5, Book 36, Hadith 3939