Riyad as-Salihin #816
The Book of Du'a (Supplications)
Abud-Darda' (May Allah be pleased with him) reported: The Messenger of Allah (ﷺ) said, "The supplication of a Muslim for his (Muslim) brother in his absence will certainly be answered. Everytime he makes a supplication for good for his brother, the angel appointed for this particular task says: 'A meen! May it be for you, too'.".
Narrated by Abud-Darda' (May Allah be pleased with him) reported:
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About Riyad as-Salihin
This hadith is #816 from Riyad as-Salihin, in the Book of The Book of Du'a (Supplications) and narrated by Abud-Darda' (May Allah be pleased with him) reported:. Riyad as-Salihin contains 1,896 hadiths across 20 books.