(15) باب مَا جَاءَ سِبَابُ الْمُسْلِمِ فُسُوقٌ
Narrated Ibn Mas'ud:
that the Messenger of Allah (ﷺ) said: "Verbally abusing a Muslim is disobedience and fighting him is disbelief." (ID)
Reference (ID): Jami` at-Tirmidhi 2635 (ID)
In-book reference (ID): Book 40, Hadith 30 (ID)
English translation (ID): Vol. 5, Book 38, Hadith 2635 (ID)