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السيوطي:٢١٤٩٧a

"مَنْ دَعَا لأَخِيه بظَهْر الْغَيب، قَال الْمَلَكُ الْمُوَكَّلُ بِهِ: آمين وَلَكَ بِمِثْلٍ".  

[م] مسلم [د] أبو داود عن أَبي الدرداء

See similar narrations below:

Collected by Muslim, Ibn Ḥibbān, Bayhaqī, Suyūṭī

Angles make duʿāʾ for the one who makes duʿāʾ for others

muslim:2732aAḥmad b. ʿUmar b. Ḥafṣ al-Wakīʿī > Muḥammad b. Fuḍayl from my father > Ṭalḥah b. ʿUbaydullāh b. Karīz > Um al-Dardāʾ > Abū al-Dardāʾ

the Messenger of Allah ﷺ said, “There is no believing servant who supplicates for his brother behind his back except that the Angels say: May the same be for you.”  

مسلم:٢٧٣٢aحَدَّثَنِي أَحْمَدُ بْنُ عُمَرَ بْنِ حَفْصٍ الْوَكِيعِيُّ حَدَّثَنَا مُحَمَّدُ بْنُ فُضَيْلٍ حَدَّثَنَا أَبِي عَنْ طَلْحَةَ بْنِ عُبَيْدِ اللَّهِ بْنِ كَرِيزٍ عَنْ أُمِّ الدَّرْدَاءِ عَنْ أَبِي الدَّرْدَاءِ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ «مَا مِنْ عَبْدٍ مُسْلِمٍ يَدْعُو لأَخِيهِ بِظَهْرِ الْغَيْبِ إِلاَّ قَالَ الْمَلَكُ وَلَكَ بِمِثْلٍ.»  

Angels make duʿāʾ for the one who makes duʿāʾ for this brother

muslim:2732bIsḥāq b. Ibrāhīm > al-Naḍr b. Shumayl > Mūsá b. Sarwān al-Muʿallim > Ṭalḥah b. ʿUbaydullāh b. Karīz > Um al-Dardāʾ from my husband

that he heard the Messenger of Allah ﷺ say, “He who supplicates for his brother behind his back (in his absence), the representative Angel [assigned] to him says: Amen, and it is for you also.”  

مسلم:٢٧٣٢bحَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ أَخْبَرَنَا النَّضْرُ بْنُ شُمَيْلٍ حَدَّثَنَا مُوسَى بْنُ سَرْوَانَ الْمُعَلِّمُ حَدَّثَنِي طَلْحَةُ بْنُ عُبَيْدِ اللَّهِ بْنِ كَرِيزٍ قَالَ حَدَّثَتْنِي أُمُّ الدَّرْدَاءِ قَالَتْ حَدَّثَنِي سَيِّدِي

أَنَّهُ سَمِعَ رَسُولَ اللَّهِ ﷺ يَقُولُ: «مَنْ دَعَا لأَخِيهِ بِظَهْرِ الْغَيْبِ، قَالَ الْمَلَكُ الْمُوَكَّلُ بِهِ: آمِينَ وَلَكَ بِمِثْلٍ.»  

ذِكْرُ اسْتِحْبَابِ كَثْرَةِ دُعَاءِ الْمَرْءِ لِأَخِيهِ بِظَهْرِ الْغَيْبِ رَجَاءَ الْإِجَابَةِ لَهُمَا بِهِ

ibnhibban:989Muḥammad b. al-Ḥusayn b. Mukram Bi-al-Baṣrah > Muḥammad b. Yazīd al-Rifāʿī > Ibn Fuḍayl from my father > Ṭalḥah b. ʿUbaydullāh b. Karīz > Um al-Dardāʾ > Abū al-Dardāʾ

There is no believing servant who supplicates for his brother behind his back (in his absence) that the Angels do not say: The same be for you too. (Using translation from Muslim 2732a)   

ابن حبّان:٩٨٩أَخْبَرَنَا مُحَمَّدُ بْنُ الْحُسَيْنِ بْنِ مُكْرَمٍ بِالْبَصْرَةِ قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ يَزِيدَ الرِّفَاعِيُّ قَالَ حَدَّثَنَا ابْنُ فُضَيْلٍ قَالَ حَدَّثَنَا أَبِي عَنْ طَلْحَةَ بْنِ عُبَيْدِ اللَّهِ بْنِ كَرِيزٍ عَنْ أُمِّ الدَّرْدَاءِ عَنْ أَبِي الدَّرْدَاءِ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ «مَا مِنْ مُسْلِمٍ يَدْعُو لِأَخِيهِ بِظَهْرِ الْغَيْبِ إِلَّا قَالَ الْمَلَكُ وَلَكَ بِمِثْلٍ وَلَكَ بِمِثْلٍ»  

bayhaqi:6431Abū ʿAbdullāh al-Ḥāfiẓ > Abū al-Faḍl b. Ibrāhīm > Aḥmad b. Salamah > Isḥāq b. Ibrāhīm > al-Naḍr b. Shumayl > Mūsá b. Tharwān al-Muʿallim > Ṭalḥah b. ʿUbaydullāh b. Karīz al-Khuzāʿī > Um al-Dardāʾ > Sayyidī

My husband reported that he heard Allah's Mes- senger ﷺ 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. (Using translation from Muslim 2732b)   

البيهقي:٦٤٣١أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ أنبأ أَبُو الْفَضْلِ بْنُ إِبْرَاهِيمَ ثنا أَحْمَدُ بْنُ سَلَمَةَ ثنا إِسْحَاقُ بْنُ إِبْرَاهِيمَ أنبأ النَّضْرُ بْنُ شُمَيْلٍ ثنا مُوسَى بْنُ ثَرْوَانَ الْمُعَلِّمُ حَدَّثَنِي طَلْحَةُ بْنُ عُبَيْدِ اللهِ بْنِ كَرِيزٍ الْخُزَاعِيُّ قَالَ حَدَّثَتْنِي أُمُّ الدَّرْدَاءِ قَالَتْ حَدَّثَنِي سَيِّدِي

أَنَّهُ سَمَعَ رَسُولَ اللهِ ﷺ يَقُولُ مَنْ دَعَا لِأَخِيهِ بِظَهْرِ الْغَيْبِ قَالَ الْمَلَكُ الْمُوَكَّلُ بِهِ آمِينَ وَلَكَ بِمِثْلٍ  

رَوَاهُ مُسْلِمٌ فِي الصَّحِيحِ عَنْ إِسْحَاقَ بْنِ إِبْرَاهِيمَ