Sahih Muslim Book 035, Hadith Number 6589.

Chapter : Excellence of supplicating for the Muslims behind their back (in their absence).

Umm Darda reported: My husband reported that he heard Allah's Messenger (may peace be upon him) as saying: He who supplicates for his brother behind his back (in his absence), the Angel commissioned (for carrying supplication to his Lord) says: Amen, and it is for you also.

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