(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)." (PT)
Reference (PT): Sunan Ibn Majah 3940 (PT)
In-book reference (PT): Book 36, Hadith 15 (PT)
English translation (PT): Vol. 5, Book 36, Hadith 3940 (PT)