Birth of Islam. One day in the year 610 C.E. when Muhammad (peace be on him) was praying in the cave of Hira outside Makkah, the angel Gabriel appeared to him, and conveyed to him the tidings that Allah had chosen him as His Messenger, and he was to convey to the people the message of Islam. That was a novel sensation. As the Holy Prophet came home, he felt agitated. Khadija comforted him, and was the first person to be converted to Islam. Khadija consulted her cousin Waraqa who was proficient in religious lore. He gave Khadija the glad tidings that her husband was the Prophet of God, about whose advent there were references in the scriptures of the Jews and the Christians. After Khadija, Ali, then a young boy living with the Holy Prophet, accepted Islam. Thereafter Zaid b Harith a slave whom the Holy Prophet had adopted as his son became a Muslim.

Abu Bakr's conversion to Islam. When the Holy Prophet gave the call of Islam, Abu Bakr was out of Makkah. He had gone on a business trip to Yemen. When Abu Bakr returned to Makkah, he was informed by some of his friends that in his absence Muhammad (peace be on him) had declared himself as the Messenger of God, and proclaimed a new religion. On hearing this, Abu Bakr lost no time in calling on the Holy Prophet.

The Holy Prophet told Abu Bakr full details of his experience in the cave of Hira, the visitation of the angel Gabriel, and the command of Allah to call the people to Him. On hearing the account, Abu Bakr felt inspired. He felt convinced that what the Holy Prophet had said was the truth. Overwhelmed with emotion, and elated with joy at the discovery of the truth, Abu Bakr said, "I believe in you and your mission from the depths of my heart. I testify and confirm that what you say is the truth. Call me to your religion, for verily you are the Prophet of God and that is a great honor."

The Holy Prophet stretched his hand, and Abu Bakr grasped it reverently as a mark of faith and allegiance. He declared with great solemnity, "There is no god but Allah, and Muhammad is His prophet and messenger." This declaration forged new bonds between the Holy Prophet and Abu Bakr. Heretofore only three family members of the Holy Prophet, namely Khadija, Ali, and Zaid bin Harith had accepted Islam. Abu Bakr was the first person outside the family of the Holy Prophet to become a Muslim.