Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
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:5529a –
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السيوطي:٥٥٢٩a –

"إِنَّ الرَّجُلَ لَيقومُ فِي الصَّلاةِ فَيدْعُو الدَّعْوَةَ فَيغْفَرُ لَهُ، وَمَنْ وَرَاءَه من النَّاسِ".  

[طب] الطبرانى في الكبير عن أبي أُمامة

See similar narrations below:

Collected by Ṭabarānī
tabarani:7693 – Abū Zayd al-Ḥawṭī > Abū al-Yamān al-Ḥakam b. Nāfiʿ > ʿUfayr b. Maʿdān > Sulaym b. ʿĀmir > Abū Umāmah > Rasūl Allāh Ṣallá

[Machine] I heard the Messenger of Allah, ﷺ , saying, "Indeed, a man may stand in prayer and supplicate, and his supplication will be answered, as well as the supplications of those behind him."  

الطبراني:٧٦٩٣ – حَدَّثَنَا أَبُو زَيْدٍ الْحَوْطِيُّ ثنا أَبُو الْيَمَانِ الْحَكَمُ بْنُ نَافِعٍ ثنا عُفَيْرُ بْنُ مَعْدَانَ عَنْ سُلَيْمِ بْنِ عَامِرٍ عَنْ أَبِي أُمَامَةَ قَالَ

سَمِعْتُ رَسُولَ اللهِ صَلَّى اللهُ ﷺ يَقُولُ «إِنَّ الرَّجُلَ لَيَقُومُ فِي الصَّلَاةِ فَيَدْعُو الدَّعْوَةَ فَيُغْفَرُ لَهُ وَلِمَنْ وَرَاءَهُ مِنَ النَّاسِ»