Sunan an-Nasa'i 4109
سنن النسائي#4109Sahihأَخْبَرَنَا مَحْمُودُ بْنُ غَيْلاَنَ، قَالَ حَدَّثَنَا أَبُو دَاوُدَ، قَالَ حَدَّثَنَا شُعْبَةُ، قَالَ قُلْتُ لِحَمَّادٍ سَمِعْتُ مَنْصُورًا، وَسُلَيْمَانَ، وَزُبَيْدًا، يُحَدِّثُونَ عَنْ أَبِي وَائِلٍ، عَنْ عَبْدِ اللَّهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " سِبَابُ الْمُسْلِمِ فُسُوقٌ وَقِتَالُهُ كُفْرٌ " . مَنْ تَتَّهِمُ أَتَتَّهِمُ مَنْصُورًا أَتَتَّهِمُ زُبَيْدًا أَتَتَّهِمُ سُلَيْمَانَ قَالَ لاَ وَلَكِنِّي أَتَّهِمُ أَبَا وَائِلٍ .
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
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 37:144