Hadith 411

Anas b. Malik reported: The Messenger of Allah (may peace be upon him) fell down from a horse and his right side was grazed, and the rest of the hadith is the same with the addition of these words:" When he (the Imam) says prayer standing, you should also do so."

حَدَّثَنِي حَرْمَلَةُ بْنُ يَحْيَى، أَخْبَرَنَا ابْنُ وَهْبٍ، أَخْبَرَنِي يُونُسُ، عَنِ ابْنِ شِهَابٍ، أَخْبَرَنِي أَنَسُ بْنُ مَالِكٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم صُرِعَ عَنْ فَرَسٍ فَجُحِشَ شِقُّهُ الأَيْمَنُ بِنَحْوِ حَدِيثِهِمَا وَزَادَ ‏"‏ فَإِذَا صَلَّى قَائِمًا فَصَلُّوا قِيَامًا ‏"‏ ‏.‏

Reference: 309510
In-book reference: Book 4, Hadith 411 c
Hadith 411 - The Book of Menstruation - Sahih Muslim - Sunnah.com