When the Messenger of Allah ﷺ grew heavy with age, he would recite as much of the Quran as Allah willed while seated. When thirty or forty verses of the surah remained, he would stand, recite them, and then perform the prostration.
حدثنا أبو معاوية حدثنا هشام بن عروة عن أبيه
كان رسول الله ﷺ لما بدن وثقل يقرأ ما شاء الله عز وجل وهو جالس فإذا غبر من السورة ثلاثون أو أربعون آية قام فقرأها ثم سجد
No references are available.
Its isnad is sahih. Bukhari related it in 3/33, no. 1148 of Fath, in the book on tahajjud, and Muslim in 1/505, no. 731, in the book on travelers, and Bayhaqi in 2/490, both of them in the book on prayer.