Musannaf Ibn Abi Shaybah

Hazrat Abu Zubair narrates that Hazrat Safwan bin Abdullah bin Safwan, in whose marriage was Hazrat Darda, came to his wife and found Hazrat Umm Darda with her, and Hazrat Abu Darda was not there. So Hazrat Umm Darda said to him: "Do you intend to perform Hajj this year?" Safwan said: "Yes." Hazrat Umm Darda said: "Pray for good for us as well, for the Noble Prophet (peace and blessings be upon him) used to say: 'Indeed, a man's supplication for his brother in his absence is accepted. Near the head of the one who supplicates is an angel who says 'Ameen' to his supplication. Whenever he prays for good for his brother, the angel says: Ameen, and may you have the same.'" Then Safwan bin Abdullah says that I went to the market and met Hazrat Abu Darda, and he also narrated this hadith to me from the Noble Prophet (peace and blessings be upon him).