(27) باب قِتَالِ الْمُسْلِمِ
It was narrated from Shu'bah, from Abu Ishaq who said:
"I heard Abu Al-Ahwas (narrate) that 'Abdullah said: 'Defaming a Muslim is evildoing and fighting him is Kufr.'" So Aban said to him: "O Abu Ishaq! You heard it only from Abu Al-Ahwas?" He said: "Rather, I heard it from Al-Aswad and Hubairah."
Reference: Sunan an-Nasa'i 4106
In-book reference: Book 37, Hadith 141
English translation: Vol. 5, Book 37, Hadith 4111