After completing his last pilgrimage (Hajjatul-Wada'), Prophet [s] was leaving Makkah toward Madinah, where he and the crowd of people reached a place called Ghadir Khumm (which is close to today's al-Juhfah). It was a place where people from different provinces used to greet each other before taking different routes for their homes.
O Allah, on this day, grant me the obedience of the humble, expand my chest through the repentance of the humble, by Your security, O the shelter of the fearful.