I prayed behind the Messenger of Allah (ﷺ) at Mina, and there was the greatest number of people, and they prayed two rak'ahs on the occasion of the Farwell Pilgrmage. (Muslim said: Haritha b. Wahb al-Khuza'i is the brother of 'Ubaidullah b. 'Umar son of Khattab from the side of mother.)
Reference: Sahih Muslim 696 b In-book : Book 6, Hadith 30 USC-MSA web (English) : Book 4, Hadith 1486 (deprecated)
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