The Ghadir event took place during the Farewell Pilgrimage, (10 A.
The Ghadir event took place during the Farewell Pilgrimage, (10 A.H.). The space was 25 years, during which many events took place such as a devastating plague, wars, conquering of new countries, and the invasions contemporary to the three righteous caliphs.
During this long period, 1 of a century, with wars and 4 invasions, in addition to a sweeping and devastating plague, many of those who had witnessed the Ghadir event, especially the old Sahabah as well as their youths who were eager to makejihad in the way of Allah died. Some of them were scattered throughout the land, and many of those were not present at the Rahba, except those who kept company with Imam Ali in Iraq, and they were only males.
In spite of all these, 30 Sahabah, twelve of them were participants in the Battle of Badr, had heard hadith al-Ghadir from the Messenger of Allah, (peace be upon him and his progeny). There may have been others who hated to testify, such as Anas ibn MaIik17 and others who received their due punishment in lieu of the pray of Ali (p.b.u.h.) to Allah, to punish those who hid the truth while knowing it.
Had he been able to gather all Sahabis who were alive then, males and females, and address them in the same way which he employed at Rahha, several times that many would have testified; so, what if he had asked people in Hijaz before the passage of such a long time after the incident of the Ghadir? Contemplate upon this fact and you will find it a very strong proof testifying to the consecutive reporting ofhadith al-Ghadir.
The books' of tradition should suffice you in their documentation ofhadith al-Ghadir. For example, 1mam Ahmed has quoted on page 370, Vol 4, of his "Musnad" from Abu Tufayl who said: "Ali gathered people at the Rahba. Then he said to them: 'I adjure in the name of Allah every Muslim who heard what the Messenger of Allah, (peace be upon him and his progeny), had said on the Ghadir Day to state his testimony". Thirty persons stood up.
Abu Na'im said: "Many stood up and testified how the Prophet took Ali by the hand, and asked people: "Do you know that I have more authority over the believers than the believers themselves have?" They answered: "We do, 0 Messenger of Allah!" Then he said: "To whomsoever I have been a mowla, this Ali is his mowla. 0 Lord! Befriend whoever befriends him, and be enemy of wl}.oever sets himself as his enemy".