Conversion to Islam. He accepted Islam without any hesitation, argument or reluctance. His conversion to Islam became a landmark in the history of Islam. His conversion according to Muir proved to be the greatest guarantee of the sincerity of Muhammad (peace be on him).
Missionary of Islam. He was the greatest missionary of Islam after the Holy Prophet. Through his efforts many young men among the Quraish joined the fold of Islam.
Liberation of slaves. When the slaves who had accepted Islam were tortured by the Quraish, Abu Bakr purchased these slaves from their masters and set them free.
Persecutions of the Quraish. Whenever the Quraish maltreated the Holy Prophet and did him violence, Abu Bakr always intervened to protect the Holy Prophet.
Ascension. When the Holy Prophet gave an account of his ascension and some of the Muslims, even, were overcome by doubts, Abu Bakr declared in unequivocal terms that what the Holy Prophet said was the truth. Abu Bakr became a witness to the truth.
Migration. When the Holy Prophet migrated from Makkah to Madina, Abu Bakr was his companion. Abu Bakr looked after the Holy Prophet with the affection and tenderness of a true friend. He met the entire expenses of the journey.
Masjid-i-Nabvi. When the Holy Prophet purchased a plot of land for constructing a mosque at Madina, Abu Bakr paid the price.
Battles. In the battle of Badr, Abu Bakr acted as a bodyguard of the Holy Prophet. In the battle of Uhud when there was confusion and other companions dispersed, Abu Bakr was the first to join the Holy Prophet. In the battle of Hunain when the other companions dispersed, Abu Bakr continued to attend the Holy Prophet.
Hudaibiya Pact. When the Hudaibiya Pact was executed and some of the companions, including Umar were critical of the terms of the Pact, Abu Bakr supported the Holy Prophet, and held that it was in the best interest of the Muslims.
Liberal contribution. When the Holy Prophet invited contributions for the financing of the Tabuk expedition, Abu Bakr donated all that he had, saying that for him and his family Allah and the Holy Prophet were enough.
Psychological crisis. When the Holy Prophet died the entire Muslim community was in the throes of a psychological crisis, and even such a man as Umar declared, "Who says that the Holy Prophet is dead? Moses like he has gone to meet the Lord, and would return to us after some time". At this juncture, Abu Bakr perceived the grim reality and said, "He who worships Muhammad let him know that Muhammad (peace be on him) being a mortal is dead. But he who worships the God of Muhammad (peace be on him), let him know that He being immortal lives and would live for ever".
Support for the Holy Prophet. Abu Bakr did not support the Holy Prophet in his lifetime alone; he supported him even after his death. When it was suggested to him that Usama's expedition should not be dispatched or at least Usama should be replaced by a veteran commander, Abu Bakr rejected the demands on the ground that the orders of the Holy Prophet had to be followed at all costs, and could not be reversed.
Zakat. When some tribes sought exemption from Zakat, Abu Bakr refused the demand on the ground that with regard to a fundamental injunction of Islam there could be no compromise.
Caliphate. When a political crisis threatened the Muslim community in the matter of the successor to the Holy Prophet, Abu Bakr was able to persuade the Ansar to relinquish the caliphate in favor of the Quraish.
Savior of Islam. When after the death of the Holy Prophet the Muslim community came to be threatened with danger from all sides, Abu Bakr piloted the crisis with consummate skill. He did not merely save Islam in Arabia; he made Islam a world force which successfully confronted the empires of Persia and Byzantium. Abu Huraira, an eminent companion, declared that but for Abu Bakr, Islam would have disintegrated. Abu Bakr, verily, played the role of the savior of Islam.
Preservation of the Holy Ouran. Abu Bakr sponsored the compilation of the Mushaf, and in this way the Word of God was preserved for all times for the guidance of mankind.