Volume 1, Book 12, Number 699:
Narrated Anas bin Malik Al-Ansari:
Allah's Apostle rode a horse and fell down and the right side of
his body was injured. On that day he prayed one of the prayers sitting and we
also prayed behind him sitting. When the Prophet finished the prayer with
Taslim, he said, "The Imam is to be followed and if he prays standing then
pray standing, and bow when he bows, and raise your heads when he raises his
head; prostrate when he prostrates; and if he says "Sami'a-l-lahu Liman
hamida", you should say, "Rabbana wa-laka-l hamd.:






