"The Messenger of Allah ﷺ did not refrain from (kissing) my forehead when he was fasting, and he did not die until most of his prayers were offered sitting down." Then she said something to the effect that (referred to the prayers) other than the obligatory prayers. "And the dearest of actions to him was that in which a person persists, even if it is little." (Using translation from Nasāʾī 1652)   

«مَا كَانَ رَسُولُ اللهِ ﷺ يَمْتَنِعُ مِنْ وَجْهِي وَهُوَ صَائِمٌ وَمَا مَاتَ حَتَّى كَانَ أَكْثَرُ صَلَاتِهِ قَاعِدًا ثُمَّ ذَكَرَ كَلِمَةً مَعَنَاهَا إِلَّا الْمَكْتُوبَةَ وَكَانَ أَحَبُّ الْعَمَلِ إِلَيْهِ مَا دَاوَمَ عَلَيْهِ الْإِنْسَانُ وَإِنْ كَانَ يَسِيرًا» خَالَفَهُ يُونُسُ  

[Machine] The Messenger of Allah ﷺ did not perform most of his prayers while sitting, except for the obligatory ones. Shu'bah disagreed with this.  

«مَا قُبِضَ رَسُولُ اللهِ ﷺ حَتَّى كَانَ أَكْثَرُ صَلَاتِهِ جَالِسًا إِلَّا الْمَكْتُوبَةَ» خَالَفَهُ شُعْبَةُ  

"The Messenger of Allah ﷺ did not pass away until most of his prayers were offered sitting down, except for the obligatory prayers, and the dearest of actions to him were those which were done persistently, even if they were few." (Using translation from Nasāʾī 1654)   

مَا مَاتَ رَسُولُ اللهِ ﷺ حَتَّى كَانَ «أَكْثَرُ صَلَاتِهِ قَاعِدًا إِلَّا الْفَرِيضَةَ وَكَانَ أَحَبُّ الْعَمَلِ إِلَيْهِ أَدْوَمُهُ وَإِنْ قَلَّ» خَالَفَهُ عُثْمَانُ بْنُ أَبِي سُلَيْمَانَ  

'A'isha reported that the Messenger of Allah ﷺ died (in this very state) that he observed most of his (Nafl) prayers in a sitting position. (Using translation from Muslim 732c)  

أَنَّ رَسُولَ اللهِ ﷺ لَمْ يَمُتْ حَتَّى كَانَ «كَثِيرٌ مِنْ صَلَاتِهِ وَهُوَ جَالِسٌ»