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Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
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السيوطي:١٩٥٨٨a –

"مَا مِنْ مُسْلِمٍ يَدْعُو لأَخِيهِ بدَعْوةٍ بِظَهْرِ الْغَيبِ: اللَّهُمَّ أَخِى فُلانٌ فَاغْفِرْ لَهُ، إلا قَالتِ الْمَلائِكَةُ: آمِين وَلَكَ بِمِثْلٍ".  

[طب] الطبرانى في الكبير عن أَبي الدرداءِ

See similar narrations below:

Collected by Muslim, Ibn Ḥibbān, Suyūṭī

Angles make duʿāʾ for the one who makes duʿāʾ for others

muslim:2732a – Aḥmad 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:٢٧٣٢a – حَدَّثَنِي 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.»  

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

ibnhibban:989 – Muḥammad 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:٩٨٩ – أَخْبَرَنَا 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»