The first Hajj under Islam was in the ninth year of Hijrah. The Prophet sallallahu ‘alayhi wa sallam was too busy at Madinah to lead the Hajj, so he sent Abu Bakr as his agent, he was to lead the Hajj in place of the Prophet.
The Prophet sallallahu ‘alayhi wa sallam led the prayers himself ever since he arrived at Madinah. During his last illness, the Prophet could no longer lead the prayers, he was too weak to go to the mosque, he therefore had to choose someone to fill such high position after him. Abu Bakr was also the one who was honored to be chosen by the Prophet for such a task.
Such was the quality of the humble and generous Companion who believed the Prophet in everything to the extent that he was called As Siddiq, by the Prophet. His great personality and service to Islam and Muslims earned him the love and respect of all Muslims, so that he was chosen as the first Caliph after the death of the Prophet by all Muslims.