(27) باب قِتَالِ الْمُسْلِمِ
It was narrated from Shu'bah who said:
"I said to Hammad: 'I heard Mansur, and Sulaiman, and Zubaid narrating from Abu Wa'il, from 'Abdullah, that the Messenger of Allah [SAW] said: "Defaming a Muslim is evildoing and fighting him is Kufr." - Who are you worried about? Are you worried about Mansur? Are you worried about Zubaid? Are you worried about Sulaiman?' He said: 'No, but I am worried about Abu Wa'il.'" (ID)
Reference (ID): Sunan an-Nasa'i 4109 (ID)
In-book reference (ID): Book 37, Hadith 144 (ID)
English translation (ID): Vol. 5, Book 37, Hadith 4114 (ID)