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:13372a –
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السيوطي:١٣٣٧٢a –

"جوْفُ اللَّيلِ الآخِرُ، ودُبُرُ الصَّلَواتِ الْمَكْتُوباتِ".  

[ت] الترمذي حسن، [ن] النسائي [ض] ضياء المقدسي في مختاره عن أَبى أُمامة قال: قيل يا رسول اللَّه: أَىُّ الدعاءِ أَسمع؟ قال فذكره

See similar narrations below:

Collected by Nasāʾī's Kubrá
nasai-kubra:9856 – Muḥammad b. Yaḥyá b. Ayyūb > Ḥafṣ b. Ghiyāth > Ibn Jurayj > Ibn Sābiṭ > Abū Umāmah

[Machine] I said, "O Messenger of Allah, which supplication is heard?" He said, "In the depth of the last part of the night and at the end of the prescribed prayers."  

الكبرى للنسائي:٩٨٥٦ – أَخْبَرَنَا مُحَمَّدُ بْنُ يَحْيَى بْنِ أَيُّوبَ قَالَ حَدَّثَنَا حَفْصُ بْنُ غِيَاثٍ قَالَ حَدَّثَنَا ابْنُ جُرَيْجٍ عَنِ ابْنِ سَابِطٍ عَنْ أَبِي أُمَامَةَ قَالَ

قُلْتُ يَا رَسُولَ اللهِ أَيُّ الدُّعَاءِ أَسْمَعُ؟ قَالَ «جَوْفَ اللَّيْلِ الْآخِرِ وَدُبُرَ الصَّلَوَاتِ الْمَكْتُوبَاتِ»