(27) باب قِتَالِ الْمُسْلِمِ
It was narrated from Sufyan bin Zubaid, from Abu Wa'il, from 'Abdullah:
"The Messenger of Allah [SAW] said: 'Defaming a Muslim is evildoing and fighting him is Kufr.'" I said to Abu Wa'il: "Did you hear it from 'Abdullah?" He said: "Yes."
Reference: Sunan an-Nasa'i 4110
In-book reference: Book 37, Hadith 145
English translation: Vol. 5, Book 37, Hadith 4115