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 fin –
ished 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.: