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Narrated 'Abdullah:

Allah's Apostle ﷺ said, "Abusing a Muslim is Fusuq (i.e., an evil-doing), and killing him is Kufr (disbelief)."
حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ، حَدَّثَنَا شُعْبَةُ، عَنْ مَنْصُورٍ، قَالَ سَمِعْتُ أَبَا وَائِلٍ، يُحَدِّثُ عَنْ عَبْدِ اللَّهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏
"‏ سِبَابُ الْمُسْلِمِ فُسُوقٌ، وَقِتَالُهُ كُفْرٌ ‏"‏‏.‏ تَابَعَهُ غُنْدَرٌ عَنْ شُعْبَةَ‏.‏

Classification

Sahih (Authentic)

References

• Sahih al-Bukhari, 6044
• Sahih al-Bukhari, Vol. 8, Book of Good Manners, Hadith 70
• Sahih al-Bukhari, Book of Good Manners, Hadith 70