[Machine] On the authority of the Prophet ﷺ, he said, "Reviling a believer is an act of immorality (sin), and fighting against him is an act of disbelief (kufr)." In another hadith of Zubayd, I heard Aba Wa'il say.

عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ سِبَابُ الْمُؤْمِنِ فِسْقٌ وَقِتَالُهُ كُفْرٌ قَالَ فِي حَدِيثِ زُبَيْدٍ سَمِعْتُ أَبَا وَائِلٍ