Hadith 1655

It was narrated from Abu Salamah, that Umm Salamah said: "By the One in Whose Hand is my soul. The Messenger of Allah (SAW) 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."

أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ عَبْدِ الصَّمَدِ، قَالَ حَدَّثَنَا يَزِيدُ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ أَبِي إِسْحَاقَ، عَنْ أَبِي سَلَمَةَ، عَنْ أُمِّ سَلَمَةَ، قَالَتْ وَالَّذِي نَفْسِي بِيَدِهِ مَا مَاتَ رَسُولُ اللَّهِ صلى الله عليه وسلم حَتَّى كَانَ أَكْثَرُ صَلاَتِهِ قَاعِدًا إِلاَّ الْمَكْتُوبَةَ وَكَانَ أَحَبُّ الْعَمَلِ إِلَيْهِ مَا دَاوَمَ عَلَيْهِ وَإِنْ قَلَّ ‏.‏ خَالَفَهُ عُثْمَانُ بْنُ أَبِي سُلَيْمَانَ فَرَوَاهُ عَنْ أَبِي سَلَمَةَ عَنْ عَائِشَةَ ‏.‏

Reference: 1116630
In-book reference: Book 20, Hadith 1655
Hadith 1655 - The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day - Sunan an-Nasa'i - Sunnah.com