Sahih al-Bukhari

Sahih al-Bukhari, Hadith 7076

Book 92: Afflictions and the End of the World
Chapter 8: Chapter: “Do not renegade as disbelievers after me by striking the neck of one another.”

باب قَوْلِ النَّبِيِّ صلى الله عليه وسلم ‏"‏ لاَ تَرْجِعُوا بَعْدِي كُفَّارًا، يَضْرِبُ بَعْضُكُمْ رِقَابَ بَعْضٍ

حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ، حَدَّثَنِي أَبِي، حَدَّثَنَا الأَعْمَشُ، حَدَّثَنَا شَقِيقٌ، قَالَ قَالَ عَبْدُ اللَّهِ قَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ سِبَابُ الْمُسْلِمِ فُسُوقٌ، وَقِتَالُهُ كُفْرٌ ‏"‏‏.‏

Narrated `Abdullah:

The Prophet, said, "Abusing a Muslim is Fusuq (evil doing) and killing him is Kufr (disbelief).

Read it in place: 92. Afflictions and the End of the World