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حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ حَدَّثَنَا شُعْبَةُ عَنْ مَنْصُورٍ وَزُبَيْدٌ عَنْ أَبِي وَائِلٍ عَنْ عَبْدِ اللَّهِ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنَّهُ قَالَ سِبَابُ الْمُؤْمِنِ فِسْقٌ وَقِتَالُهُ كُفْرٌ قَالَ فِي حَدِيثِ زُبَيْدٍ سَمِعْتُ أَبَا وَائِلٍ

Narrated to us [Muhammad bin Ja'far] has told us [Syu'bah] from [Mansur], and [Zubaid] from [Abu Wa`il] from [Abdullah] from the Prophet sallallaahu 'alaihi wasallam, he said: "Reviling a believer is wickedness and fighting him is kufr." He said in the Zubaid hadith; I heard Abu Wa`il.