(27) باب قِتَالِ الْمُسْلِمِ
It was narrated that 'Abdullah said:
"Fighting a believer is Kufr and defaming him is evildoing." (RU)
Reference (RU): Sunan an-Nasa'i 4113 (RU)
In-book reference (RU): Book 37, Hadith 148 (RU)
English translation (RU): Vol. 5, Book 37, Hadith 4118 (RU)