(2) باب قَصْرِ الصَّلاَةِ بِمِنًى
Wahb al-Khuza'i reported:
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.)
Reference: Sahih Muslim 696 b
In-book reference: Book 6, Hadith 30
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1486