On Thursday the 18th of Dhu al-Hijjah, the Muslims arrived at Ghadir Khumm. The following verse of the Quran was revealed at the historic occassion:

O Messenger! proclaim the (message) which hath been sent to thee from thy Lord. If thou didst not, thou wouldst not have fulfilled and proclaimed His mission. And Allah will defend thee from men (who mean mischief). For Allah guideth not those who reject Faith (5:67).[5]

According to the verse, Muhammad was obliged to proclaim an important message. The verse clearly denotes the importance of the message, by saying that if he does not announce it, then he has not performed his mission. After revelation of the verse, Muhammad ordered the caravan to stop, and ordered those who had passed Ghadir Khumm to return, and for them to wait there until the arrival of those who were still on their way.[6][7] Sunni Muslims, however, believe neither the verse was revealed at Ghadir Khumm nor it was about anyone's appointment as successor, rather it was God's command to Prophet Muhammad to proclaim every message of Islam without fearing anyone.

According to Shia scholar Sheikh Abdul Hosein Amini’s work Al-Ghadir, immediately after Muhammad had finished his speech, the following verse of the Quran was revealed:

This day have those who reject faith given up all hope of your religion: yet fear them not but fear Me. This day have I perfected your religion for you, completed My favour upon you, and have chosen for you Islam as your religion (5:3).

Sunni Muslims believe this verse was revealed during the Farewell Pilgrimage of the Prophet Muhammad on the Day of Arafah, the ninth day of Dhul Hijja.

References

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Amir-Moezzi, Mohammad Ali (2014). "Ghadīr Khumm". In Fleet, Kate; Krämer, Gudrun; Matringe, Denis; Nawas, John; Rowson, Everett. Encyclopaedia of Islam (Third ed.).

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