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
nasai-kubra:427 – Aḥmad b. Saʿīd > al-ʿAlāʾ / Ibn ʿUṣaym > Abū al-Aḥwaṣ > al-Aʿmash > ʿUmārah b. ʿUmayr > Yaḥyá b. al-Jazzār > ʿĀʾishah

[Machine] That the Messenger of Allah ﷺ used to pray nine units of prayer at night. But when he grew old and weak, he prayed seven units of prayer.  

الكبرى للنسائي:٤٢٧ – أَخْبَرَنَا أَحْمَدُ بْنُ سَعِيدٍ قَالَ حَدَّثَنَا الْعَلَاءُ وَهُوَ ابْنُ عُصَيْمٍ قَالَ حَدَّثَنَا أَبُو الْأَحْوَصِ عَنِ الْأَعْمَشِ عَنْ عُمَارَةَ بْنِ عُمَيْرٍ عَنْ يَحْيَى بْنِ الْجَزَّارِ عَنْ عَائِشَةَ

أَنَّ رَسُولَ اللهِ ﷺ كَانَ «يُصَلِّي مِنَ اللَّيْلِ تِسْعَ رَكَعَاتٍ فَلَمَّا كَثُرَ لَحْمُهُ وَأَسَنَّ صَلَّى سَبْعَ رَكَعَاتٍ»  

See similar narrations below:

Collected by Nasāʾī
nasai:1709 – Aḥmad b. Sulaymān > Ḥusayn > Zāʾidah > Sulaymān > ʿUmārah b. ʿUmayr > Yaḥyá b. al-Jazzār > ʿĀʾishah

"The Messenger of Allah ﷺ used to pray nine (rak'ahs) at night, then when he grew older and put on weight he prayed seven."  

النسائي:١٧٠٩ – أَخْبَرَنَا أَحْمَدُ بْنُ سُلَيْمَانَ قَالَ حَدَّثَنَا حُسَيْنٌ عَنْ زَائِدَةَ عَنْ سُلَيْمَانَ عَنْ عُمَارَةَ بْنِ عُمَيْرٍ عَنْ يَحْيَى بْنِ الْجَزَّارِ عَنْ عَائِشَةَ قَالَتْ

كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي مِنَ اللَّيْلِ تِسْعًا فَلَمَّا أَسَنَّ وَثَقُلَ صَلَّى سَبْعًا