On the way to Madina the caravan of those who had participated in the farewell pilgrimage spread over several miles. When the Holy Prophet reached the valley of Khum some midway between Makkah and Madina, the Holy Prophet received the following revelation: "O Messenger of God, make known what has been revealed to you from your Lord, for if you do it not, you will not have conveyed His message. Allah will protect you from mankind. Lo, Allah guides not the unbelieving folk."
Calling a halt near a pond Ghadir, in the valley of Khum the Holy Prophet sent men to call all persons of the caravan who had gone ahead or lagged behind to assemble there to hear the command of the Holy Prophet.