Musannaf Ibn Abi Shayba 3:6125

'Abdah ibn Sulayman narrated to us, from Hisham, from his father, from 'Aishah, who said: The Messenger of Allah (may Allah bless him and grant him peace) became ill, so some of his companions entered upon him to visit him. The Messenger of Allah (may Allah bless him and grant him peace) prayed sitting, and they prayed while standing, following his prayer. He gestured to them to sit, so they sat.