question #3 Sahih Muslim 696b, Book 6, Hadith 30 : What is the historical context of the Farewell Pilgrimage in Islamic history?

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 Farewell Pilgrimage. (Muslim said: Haritha b. Wahb al-Khuza’i is the brother of ‘Ubaidullah b. ‘Umar son of Khattab from the side of his mother.)