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
ahmad:26202 – Muḥammad b. Ismāʿīl b. Abū Fudayk > al-Ḍaḥḥāk / Ibn ʿUthmān > ʿAbdullāh b. ʿUrwah from his father > ʿĀʾishah

[Machine] she said that the Messenger of Allah, ﷺ , used to pray the most when he felt burdened and physically tired while sitting.  

أحمد:٢٦٢٠٢ – حَدَّثَنَا مُحَمَّدُ بْنُ إِسْمَاعِيلَ بْنِ أَبِي فُدَيْكٍ قَالَ حَدَّثَنَا الضَّحَّاكُ يَعْنِي ابْنَ عُثْمَانَ عَنْ عَبْدِ اللهِ بْنِ عُرْوَةَ عَنْ أَبِيهِ عَنْ عَائِشَةَ

أَنَّهَا قَالَتْ كَانَ أَكْثَرُ صَلَاةِ رَسُولِ اللهِ ﷺ حِينَ ثَقُلَ وَبَدَّنَ وَهُوَ جَالِسٌ  

See similar narrations below:

Collected by Muslim, Aḥmad, Ḥākim
muslim:732d – Muḥammad b. Ḥātim And Ḥasan al-Ḥulwānī > Zayd > Ḥasan > Zayd b. al-Ḥubāb > al-Ḍaḥḥāk b. ʿUthmān > ʿAbdullāh b. ʿUrwah from his father > ʿĀʾishah

When the Messenger of Allah ﷺ grew bulky and heavy he would observe (most of his Nafl) prayers sitting.  

مسلم:٧٣٢d – وَحَدَّثَنِي مُحَمَّدُ بْنُ حَاتِمٍ وَحَسَنٌ الْحُلْوَانِيُّ كِلاَهُمَا عَنْ زَيْدٍ قَالَ حَسَنٌ حَدَّثَنَا زَيْدُ بْنُ الْحُبَابِ حَدَّثَنِي الضَّحَّاكُ بْنُ عُثْمَانَ حَدَّثَنِي عَبْدُ اللَّهِ بْنُ عُرْوَةَ عَنْ أَبِيهِ عَنْ عَائِشَةَ قَالَتْ

لَمَّا بَدَّنَ رَسُولُ اللَّهِ ﷺ وَثَقُلَ كَانَ أَكْثَرُ صَلاَتِهِ جَالِسًا  

ahmad:26544 – Abū Qaṭan > Yūnus / Ibn Abū Isḥāq from his father > al-Aswad > Um Salamah

[Machine] The Messenger of Allah, ﷺ , did not pass away until most of his prayers were performed while sitting down.  

أحمد:٢٦٥٤٤ – حَدَّثَنَا أَبُو قَطَنٍ حَدَّثَنَا يُونُسُ يَعْنِي ابْنَ أَبِي إِسْحَاقَ عَنْ أَبِيهِ عَنِ الْأَسْوَدِ عَنْ أُمِّ سَلَمَةَ قَالَتْ

مَا قُبِضَ رَسُولُ اللهِ ﷺ حَتَّى كَانَ أَكْثَرَ صَلَاتِهِ جَالِسًا  

hakim:1184 – my father

[Machine] "That the Messenger of Allah ﷺ did not die until his most frequent prayer was performed sitting."  

الحاكم:١١٨٤ – حَدَّثَنَا أَبُو بَكْرٍ أَحْمَدُ بْنُ مُحَمَّدٍ الصَّيْرَفِيُّ بِمَرْوَ ثنا أَبُو قِلَابَةَ ثنا أَبُو عَاصِمٍ أَنْبَأَ ابْنُ جُرَيْجٍ أَخْبَرَنِي عُثْمَانُ بْنُ أَبِي سُلَيْمَانَ أَنَّ أَبَا سَلَمَةَ بْنَ عَبْدِ الرَّحْمَنِ أَخْبَرَهُ أَنَّ عَائِشَةَ أَخْبَرَتْهُ

«أَنَّ رَسُولَ اللَّهِ ﷺ لَمْ يَمُتْ حَتَّى كَانَ أَكْثَرَ صَلَاتِهِ جَالِسًا»  

هَذَا حَدِيثٌ صَحِيحٌ عَلَى شَرْطِ الشَّيْخَيْنِ وَلَمْ يُخَرِّجَاهُ