(27) باب قِتَالِ الْمُسْلِمِ
It was narrated from 'Abdur-Rahman bin 'Abdullah, from his father, that:
The Messenger of Allah [SAW] said: "Defaming a Muslim is evildoing and fighting him is Kufr." (ID)
Reference (ID): Sunan an-Nasa'i 4108 (ID)
In-book reference (ID): Book 37, Hadith 143 (ID)
English translation (ID): Vol. 5, Book 37, Hadith 4113 (ID)