Al-Adab Al-Mufrad #962

Jabir said, "In Madina, the Messenger of Allah, may Allah bless him and grant him peace, was thrown from a horse onto a palm trunk and dislocated his foot. We used to visit him in the room of 'A'isha. We came upon him while he was praying sitting down and we prayed standing behind him. He indicates to us that we should sit down. When he finished the prayer, he said, 'When the Imam prays sitting, then pray sitting. When he prays standing, then pray standing. Do not stand while the imam is sitting as the Persians do with their great men.'"