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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
suyuti:7113a –
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السيوطي:٧١١٣a –

"إِنَّ مَلَكًا مُوَكَّلٌ بمن يَقُولُ: يا أَرحَمَ الرَّاحِمِينَ، فمن قَالَها ثَلَاثًا قال له الْمَلَكُ: إِنَّ أَرْحَمَ الرَّاحِمِينَ قَدْ أَقْبَلَ عَلَيْكَ فَسَلْ" .  

[ك] الحاكم في المستدرك عن أَبى أُمَامَةَ

See similar narrations below:

Collected by Ḥākim
hakim:1996 – Abū Bakr b. ʿAbdullāh al-ʿUmānī > Masʿūd b. Zakariyyā al-Tustarī > Kāmil b. Ṭalḥah > Faḍāl b. Jubayr > Abū Umāmah

[Machine] The Prophet Muhammad ﷺ said, "Indeed, Allah has an angel appointed over the one who says, 'O Most Merciful of the Merciful.' So whoever says it three times, the angel says, 'Indeed, the Most Merciful of the Merciful has accepted your supplication, so ask.'"  

الحاكم:١٩٩٦ – حَدَّثَنَاهُ أَبُو بَكْرِ بْنُ عَبْدِ اللَّهِ الْعُمَانِيُّ ثنا مَسْعُودُ بْنُ زَكَرِيَّا التُّسْتَرِيُّ ثنا كَامِلُ بْنُ طَلْحَةَ ثنا فَضَالُ بْنُ جُبَيْرٍ عَنْ أَبِي أُمَامَةَ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ لِلَّهِ مَلَكًا مُوَكَّلًا بِمَنْ يَقُولُ يَا أَرْحَمَ الرَّاحِمِينَ فَمَنْ قَالَهَا ثَلَاثًا قَالَ الْمَلَكُ إِنَّ أَرْحَمَ الرَّاحِمِينَ قَدْ أَقْبَلَ عَلَيْكَ فَاسْأَلْ