"A Shi'ite Encyclopedia" by: Ahlul Bayt Digital Islamic Library Project
The Farewell Pilgrimage
Ten years after the migration, the Messenger of Allah ordered to his close followers to call all the people in different places to join him in his last pilgrimage. On this pilgrimage he taught them how to perform the pilgrimage in a correct and unified form. This was first time that the Muslims with this magnitude gathered in one place in the presence of their leader, the Messenger of Allah. On his way to Mecca, more than seventy thousand people followed Prophet (S). On the fourth day of Dhul-Hajjah more than one hundred thousand Muslims had entered Mecca.
Revelation Of Verse 5:67
On the 18th of Dhul-Hajjah, after completing his last pilgrimage (Hajjatul-Widaa), Prophet was leaving Mecca toward Medina, where he and the crowd of people reached to a place called Ghadir Khum (which is close to today’s Juhfah). It was a place where people from different provinces should say Good bye to each other and take different routes for their home. In this place, the following verse was revealed:
"O Apostle! Deliver what has been sent down to you from your Lord; and if you don’t do it, you have not delivered His message (at all); and Allah will protect you from the people ...”(Qur’an 5:67).