Abdullah b. Shaqiq reported:I asked 'A'isha whether the Messenger of Allah (ﷺ) observed (Nafl) sitting. She said: Yes, when the people had made him old

Abdullah b. Shaqiq reported:I said to 'A'isha and she made a mention of that (recorded above) about the Messenger of Allah (ﷺ)

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

A'isha reported:When the Messenger of Allah (ﷺ) grew bulky and heavy he would observe (most of his Nafl) prayers sitting