On 18th Zilhijjah of the year 10 A.H. (10 March 632 CE), after completing the
last pilgrimage, the Holy Prophet (pbuh) along with around 100, 000 Muslims
reached a place called 'Ghadir-e-khumm' near Mecca. The following verse was
revealed: Quran 5:67]
﴾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; surely Allah will not guide the unbelieving people.﴿
On receiving the above verse, the Holy Prophet stopped at that very place &
delivered a speech an extract of which is:"....It seems the time has
approached when I shall be called away (by Allah) and I shall answer that call.
I am leaving for you two precious things and if you adhere to them both, you
will never go astray after me. They are the Book of Allah and my Progeny, that
is my Ahlul Bayt. The two shall never separate from each other until they come
to me by the Pool (of Paradise)." Then the Holy Prophet (pbuh) in an attempt
to remind Muslims of his own authority over them said: "Do I not have more
right over the believers than what they have over themselves? " Muslims
answered unanimously "Yes, O' Messenger of God". This served as a stepping stone
for the announcement of his heir and vicegerent. The Holy Prophet (pbuh) held
out the hand of Ali (as) and said: "For whoever I am his Leader (mawla), 'Ali
is his Leader (mawla)." The Holy Prophet then continued to say: "O' God,
love those who love him, and be hostile to those who are hostile to him."] ..
This day is also known as 'Ahad e-Mahood' in the heavens & as 'Meethaq-e-Maakoodh'
on the earth