عَنْ أُمِّ سَلَمَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: وَالَّذِي تَوَفَّى نَفْسَهُ! تَعْنِي النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ مَا تُوُفِّيَ حَتَّى كَانَتْ أَكْثَرُ صَلَاتِهِ قَاعِدًا إِلَّا الْمَكْتُوبَةَ، وَكَانَ أَعْجَبُ الْعَمَلِ إِلَيْهِ الَّذِي يَدُومُ عَلَيْهِ الْعَبْدُ وَإِنْ كَانَ يَسِيرًا
Sayyida Umm Salamah (may Allah be pleased with her) says: By the One Who caused the Noble Prophet (peace and blessings be upon him) to pass away! The Prophet (peace and blessings be upon him) did not pass away until he began to perform most of his prayers sitting, except for the obligatory prayers, and the deed most beloved to him was that which a servant performed consistently, even if it was a small deed.