Sahih Muslim Book 4, Hadith 86
The Messenger of Allah (ﷺ) rode a horse and fell down from it and his right side was grazed, and the rest of the hadith is the same, and (these words) are found in it:" When he (the Imam) says prayer in an erect posture, you should also say it in an erect posture."
The Messenger of Allah (ﷺ) 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."
The Messenger of Allah (ﷺ) fell down from his horse and his right side was grazed, and the rest of the hadith is the same. In this hadith there are no additions (of words) as transmitted by Yunus and Malik.