Sahih Muslim · Hadith 1743

وحدثنا عبيد الله بن معاذ، حدثنا أبي، حدثنا كهمس، عن عبد الله بن شقيق، قال قلت لعائشة ‏.‏ فذكر عن النبي صلى الله عليه وسلم بمثله ‏.‏

'A'isha reported that the Messenger of Allah (may peace be upon him) died (in this very state) that he observed most of his (Nafl) prayers in a sitting position.

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).