Eid-e-Ghadir

In historical sources, it is recorded that on the way back to Medina after performing a pilgrimage to Mecca, the Prophet received a revelation — Surah al-Ma’ida (sura 5 ayat 67):

“O Messenger, deliver [to the people] what has been revealed to you from your Lord, and if you do not do so, then you will not have delivered His message …”

Numerous reliable hadith sources — both Shia and Sunni — record this event, which took place in the year 632 CE. Upon receiving this revelation, the Holy Prophet stopped at an oasis known as Ghadir Khumm, and addressed a large gathering of Muslims who had accompanied him. It is said that The Prophet (peace be upon him and his progeny) proclaimed: “Man kuntu mawlahu fa aliyyun mawlahu” meaning: “He whose Mawla I am, Ali is his Mawla.” The Prophet then prayed: “O Allah, be a friend of whoever is his friend and extend your support to those who support him.”

According to Shia belief, by declaring Hazrat Ali as mawla after him, the Prophet (peace be upon him and his progeny) transferred his own spiritual authority bestowed upon him by Allah to Hazrat Ali, making him — and all the Imams that follow — the Amirul Mu’minin, or Master of the Believers.

On instruction from Prophet Muhammad (peace be upon him and his progeny), Hazrat Ali received bayyat (the oath of allegiance), from the Muslims assembled there. According to Shia traditions and sources, following the proclamation, the final verse (5:3) of the Qur’an was revealed to the Prophet:

“On this day, I have perfected for you your religion, completed my favours upon you, and have chosen for you Islam as your religion.”

This marks the end of the period of nabuwwa, or Prophethood, and the historical beginning of the Institution of Imamat. Eid-e Ghadir is an anniversary of special significance to all Shia Muslims, as it is also associated with the well-attested tradition in which the Prophet is said to have proclaimed:

“I am leaving among you two matters of great weight (al-thaqalayn), the Book of Allah and my kindred (itrati), the People of my House (ahl al-Bayt), and these two shall never be separated until they return to me at the Pool [of Kawthar in Paradise on the Day of Judgement]…”

The Shia Ismaili tradition bears witness to the continuity of the authority vested at Ghadir Khumm. Today, this leadership and authority is vested in Mawlana Hazar Imam. The rope of Imamat has continued over 1,400 years, from Hazrat Ali, to the present 49th hereditary Imam and direct descendant of Prophet Muhammad through Hazrat Ali and Hazrat Bibi Fatima al-Zahra, Khatun-i Jannat.

In commemorating Eid-e Ghadir, the Jamat celebrates the seminal event of Ghadir Khumm, reaffirming our allegiance to the Imam-of-the-Time as the direct lineal successor and inheritor of the authority of Hazrat Ali.

Reference: https://the.ismaili/eid-e-ghadir