Imam Khomeini also emphasized on following the footsteps of the Imam Ali (PBUH), the truthful successor of the holy prophet of Islam in all perspectives.
The Muslims commemorated the Eid al-Ghadeer, celebrating the occasion of Prophet Mohammad (PBUH) appointing Imam Ali (PBUH) as his successor.
The auspicious occasion is annually celebrated with various ceremonies and rituals in different cities, on the 18th of Dhu al-Hijjah in the Islamic calendar.
Prophet Mohammd received a revelation from God, ordering him to halt the pilgrims at a pond called Khum, a place near Mecca, and to designate Imam Ali (PBUH) as his successor in guiding and ruling Muslims.
Eid al-Ghadeer is also known as Eid al-Akbar (the greatest Eid) in Islamic narrations, since Muslims believe that the mission of all the previous messengers of Allah became accomplished on this day.
Ghadir is on the way from the holy city of Mecca to Madina. While returning from Mecca to Madina, after the last hajj, alongwith his companions, the Holy Prophet ((PBUH)) broke the journey at a lake, 3 miles away from Al-Johfa. He (PBUH) made a stop at midday in a wayside tract of barren land with no shade other than that provided by a few acacia trees. A small lake is called as Ghadir in Arabic, so this place is known as Ghadir-e-Khumm. The name Ghadir is no longer in use.
Tabarani and others have recorded the following tradition as related by Zayd ibn 'Arqam and transmitted through sources unanimously acknowledged to be reliable. Zayd says that the Messenger of Allah, Allah's blessings and peace be upon him and his posterity, delivered a sermon at Ghadir-e-Khumm under a cloth spread as a canopy on two large trees. He said:
"O my people! I am going to be recalled shortly and I must comply. I shall be interrogated and you also shall be interrogated. What will you say then?" The entire audience answered: "We shall bear witness that you did convey to us the message of Allah, and tried your best to guide us on the right path and always gave us good console. May Allah bless you with a good reward." The Prophet proceeded: "Why do you not bear witness that there is no god but Allah and that Muhammad is His slave and Messenger, and that Paradise is true, Hell is true, Death is true, Resurrection after death is true, that the Day of Judgment will doubtlessly come and that Allah will raise to life the dead from their graves?." They said: "O Yes! We bear witness to all this." Then he said: "O Allah! You also may witness." Then he said: 'O my people! Allah is my Mawla and I am mawla of the faithful and I have superior right on and control over their lives. And this Ali is the mawla of all those of whom I am mawla. O Allah! Love him who loves him and hate him who hates him." He further said: "O my people! I will precede you and you also shall arrive at the pool of Kawthar, the pool wider than the distance between Basrah and San'a', and there are on the pool as many goblets of silver as stars. When you shall reach me I shall interrogate you about your behavior towards the two in-valuable assets after my death. The major asset is the Book of Allah, the Mighty and Glorious, one end of which is in the hand of Allah, the Exalted, and the other end of which in your hands. Grasp it tightly and do not go astray and do not change or amend it. The other asset is my Progeny, who are my Ahl al-Bayt. Allah the Gracious and Omniscient has informed me that the two will not part from each other before they reach me at the pool.
This Ghadir-e-Khumm event happened on the 18th of Dhil-Hijjah (1410 AH), in 10 Hijra in front of nearly one hundred thousand (100,000) Muslims. While returning from the last hajj (Hajjatul-wida / farewell pilgrimage) of our Holy Prophet (PBUH).
O Messenger! Deliver what has been revealed to you from your Lord; and if you do it not, then you have not delivered His message, and Allah will protect you from the people; (AL-MAEDA/5:67)
This day have I perfected for you your religion and completed My favor on you and chosen for you Islam as a religion; (AL-MAEDA/5:3)