Sahih al-Bukhari 766

It is related that Anas ibn Malik said, "The Messenger of Allah, may Allah bless him and grant him peace, fell from ('an) his horse [It is possible that Sufyan said min rather than 'an.] while riding and his right side was grazed. We went to visit him and the time for the prayer arrived. He led us in the prayer sitting down and we stayed sitting down. [On one occasion Sufyan said, "We prayed sitting down."] When he finished the prayer, he said, 'The imam is appointed to be followed. Say the takbir when he says the takbir. Go into ruku' when he goes into ruku', and get up when he gets up. When he says, "Allah hears whoever praises Him," say, "Our Lord, praise belongs to You." Go into sajda when he goes into sajda.'" Sufyan [one of the transmitters] asked ['Al� ibn 'Abdullah], "'Is that is how Ma'mar brought it?' I answered, 'Yes.'" Sufyan said, "I memorized it like that." Az-Zuhri said, "And praise belongs to you [i.e. with "and"]." [Sufyan said,] "I memorized 'his right side'." [Murra said,] "When we left az-Zuhr�, Ibn Jurayj said while I was with him that his right leg was grazed." XLV: The excellence of sajda