Sahih al-Bukhari 732
صحيح البخاري#732SahihNarrated Anas bin Malik Al-Ansari:Allah's Messenger (ﷺ) 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 (ﷺ) 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 hamidah", you should say, "Rabbana wa laka l-hamd.:
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 10:126