I asked Muamar, "Did the Messenger of Allah ﷺ pass away while sitting?"He replied, "Yes."
حدثنا إبراهيم بن خالد قال حدثنا
قلت لمعمر قبض رسول الله ﷺ وهو جالس قال نعم
No references are available.
Its isnad is sahih. The manner of the death of the Messenger of Allah ﷺ has already been mentioned. See 24786 and its cross-references.