Thus we know of persons whom the Prophet appointed as his...
Thus we know of persons whom the Prophet appointed as his deputies and representatives whenever he traveled from Medina, so that Medina should not be without a leader during his absence. The Shi‘as ask how, with this evidence, it is consistent with the wisdom of the Prophet that he should die without appointing a successor. Which of the following possibilities seems reasonable: Was the Islamic society, after the death of the Prophet, not in need of a leader again?
Or did the Prophet of Islam attach no importance to the Muslim community after he had gone? Or were concerns and prudence something he could do nothing about? Or did he not know who was the worthiest successor? Which of these possibilities seems more reasonable? With the quality of leadership and the concern for the affairs of the people which we see in the Prophet of Islam, how could he have not given any guidance or instruction on this vital matter of the Muslims' leadership?
In the light of this reality, the Shi‘as proceeded to investigate the original texts and documents of Islam and they came across an enormous quantity of sources which made them conclude that there are clear, sufficient, precise orders from the Prophet of Islam about his successor: the verse of wilāyah, the hadith of Ghadīr, the hadīth of Safinah, the hadīth of Thaqalayn, and many more, all of which are tested, examined and explained in the great works done on this subject.
From all these we shall select only the hadīth of Ghadīr and we shall seek to judge its value and implications in an unprejudiced manner. The Historical Hadīth of Ghadīr In the tenth year of the Islamic calendar (hijrah), the Prophet set out for Mecca to perform the pilgrimage (hajj). This hajj was undertaken in the last years of the Prophet's life, and for this reason history has given it the name of the "Farewell Pilgrimage" ( hajjatu 'l-wida' ).
Muslims participated in extraordinarily large numbers in this journey of the Prophet to Mecca with the eagerness to learn and do the pilgrimage from the Prophet directly. They numbered about 120,000. Some groups joined him in the town of Mecca.
After completing the hajj, when the Prophet was returning to Medina, the following verse was revealed on the 18th day of Dhil Hijja at Ghadīr Khumm: O Messenger, deliver that [message] which has been sent down to you from your Lord; for if you do not, then [it be as if] you have not delivered His message [at all]. Allah will protect you from men.