Riyad as-Salihin #880
The Book of the Prohibited actions
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وعن ابن مسعود رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم :
"سباب المسلم فسوق، وقتاله كفر" ((متفق عليه)).
Ibn Mas'ud (May Allah be pleased with him) reported: The Messenger of Allah (ﷺ) said, "Reviling a Muslim is Fusuq (disobedience of Allah) and killing him is (tantamount to) disbelief.".
Narrated by Ibn Mas'ud (May Allah be pleased with him) reported:
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About Riyad as-Salihin
This hadith is #880 from Riyad as-Salihin, in the Book of The Book of the Prohibited actions and narrated by Ibn Mas'ud (May Allah be pleased with him) reported:.