Jabir said, "The Prophet, may Allah bless him and grant him peace,was ill and we prayed behind him while he was sitting down. Abu Bakr relayedhis takbir to the people. The Prophet turned towards us and saw that wewere standing. He indicated to us that we should sit down. So we prayedsitting down with him. When he said the taslim, he said, 'You were aboutto do what the Persians and Romans do. They stand in front of their kingswhen they are seated. Do not do that. Follow your Imams. If the Imam praysstanding, then pray standing. If he prays sitting down, then pray sittingdown."
English reference: Book 40, Hadith 948
Arabic reference: Book 1, Hadith 948