(202) بَابُ سِبَابِ الْمُسْلِمِ فُسُوقٌ
'Abdullah reported that the Prophet, may Allah bless him and granthim peace, said, "Reviling a Muslim is deviant behaviour and killing himis disbelief." (IT)
Reference (IT): Al-Adab Al-Mufrad 431 (IT)
In-book reference (IT): Book 24, Hadith 13 (IT)
English translation (IT): Book 24, Hadith 431 (IT)