Allah's Messenger (ﷺ) prayed in his house while sitting during his illness and the people prayed behind him
standing and he pointed to them to sit down. When he had finished the prayer, he said, "The Imam is
to be followed and so when he bows you should bow; and when he lifts his head you should also do
the same."
Sahih al-Bukhari Book 18, Hadith 33