(4) باب سِبَابُ الْمُسْلِمِ فُسُوقٌ وَقِتَالُهُ كُفْرٌ
It was narrated from Abu Hurairah that the Prophet (ﷺ) said:
"Verbally abusing a Muslim is Fusuq (disobedience) and fighting himisKufr (ungratefulness to Allah)." (TH)
Reference (TH): Sunan Ibn Majah 3940 (TH)
In-book reference (TH): Book 36, Hadith 15 (TH)
English translation (TH): Vol. 5, Book 36, Hadith 3940 (TH)