حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، عَنْ عَبْدِ الْمَلِكِ بْنِ أَبِي سُلَيْمَانَ، عَنْ أَبِي الزُّبَيْرِ، عَنْ صَفْوَانَ بْنِ عَبْدِ اللَّهِ بْنِ صَفْوَانَ، قَالَ وَكَانَتْ تَحْتَهُ ابْنَةُ أَبِي الدَّرْدَاءِ فَأَتَاهَا فَوَجَدَ أُمَّ الدَّرْدَاءِ وَلَمْ يَجِدْ أَبَا الدَّرْدَاءِ فَقَالَتْ لَهُ تُرِيدُ الْحَجَّ الْعَامَ قَالَ نَعَمْ ‏.‏ قَالَتْ فَادْعُ اللَّهَ لَنَا بِخَيْرٍ فَإِنَّ النَّبِيَّ ـ صلى الله عليه وسلم ـ كَانَ يَقُولُ ‏"‏ دَعْوَةُ الْمَرْءِ مُسْتَجَابَةٌ لأَخِيهِ بِظَهْرِ الْغَيْبِ عِنْدَ رَأْسِهِ مَلَكٌ يُؤَمِّنُ عَلَى دُعَائِهِ كُلَّمَا دَعَا لَهُ بِخَيْرٍ قَالَ آمِينَ وَلَكَ بِمِثْلِهِ ‏"‏ ‏.‏ قَالَ ثُمَّ خَرَجْتُ إِلَى السُّوقِ فَلَقِيتُ أَبَا الدَّرْدَاءِ فَحَدَّثَنِي عَنِ النَّبِيِّ ـ صلى الله عليه وسلم ـ بِمِثْلِ ذَلِكَ ‏.‏

It wasnarrated from Safwan bin ‘Abdullah bin Safwan said that he wasmarried to a daughter of Abu Darda’. He came to her and found UmmDarda’ there, but he did not find Abu Darda’. She said to him: “Do youintend to perform Hajj this year?” He said: “Yes.”She said: “Pray toAllah for us to grant us goodness, for theProphet (PBUH) used to say:‘The supplication of a man for hisbrother in his absence will beanswered. By his head there is anangel who says Amin to hissupplication, and every time he prays forhis brother, he says: “Amin,and the same for you.’” He said:“Then I went out to the marketplacewhere I met Abu Darda’, andhe told me something similar from theProphet (PBUH).” Translation Not Available

Book Ref: Sunan Ibn Majah Book 25 Hadith 2895
Web Ref:  Sunan Ibn Majah Vol 4 Book 25 Hadith 2895