Riyad as-Salihin #880
The Book of the Prohibited actions
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:. Riyad as-Salihin contains 1,896 hadiths across 20 books.