Riyad as-Salihin #1053
The Book of the Prohibited actions
Ibn 'Umar (May Allah be pleased with them) said: The Messenger of Allah (ﷺ) said, "When a person calls his brother (in Islam) a disbeliever, one of them will certainly deserve the title. If the addressee is so as he has asserted, the disbelief of the man is confirmed, but if it is untrue, then it will revert to him.".
Narrated by Ibn 'Umar (May Allah be pleased with them) said:
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About Riyad as-Salihin
This hadith is #1053 from Riyad as-Salihin, in the Book of The Book of the Prohibited actions and narrated by Ibn 'Umar (May Allah be pleased with them) said:. Riyad as-Salihin contains 1,896 hadiths across 20 books.