It has to be mentioned right from the beginning that both Prophet Muhammad and Abu Bakr Assiddeeq had similar  ¹  temperaments  ² . Both were kind, lenient,  ³  merciful  ⁴  truthful and honest. Both found comfort in solitude  ⁵  and abstained  ⁶  from drinking alcohol, even before Islam was established  ⁷ . Abu Bakr's complexion  ⁸ was fair, and he was rather slim  ⁹ . He was tender, wise  ¹⁰  and solemn  ¹¹  and seldom joined ¹²  in the polytheistic ¹³  celebrations of his countrymen  ¹⁴  .

After the Prophet had married Khadeejah, the wealthy, 40-year-old landlady ¹⁵  from Mecca, his lodging  ¹⁶ was very close to that of Abu Bakr. According to `Aishah, Abu Bakr's daughter and the prophet's wife after the death of Khadeejah, her father was frequently visited by the Prophet, with whom he developed a strong friendship ¹⁷  .

When God's message was revealed ¹⁸  to Muhammad, the first man to believe in him was Abu Bakr. In fact, Abu Bakr had always doubted the validity ¹⁹  of idolatry ²⁰  and had very little enthusiasm ²¹  for worshipping  ²²  idols. So when he accepted Islam he did his best to attract other people to it. Soon `Othman bin Affan, Abdul-Rahman bin Awf, Talhah bin Obaydillah, Sa'd bin Abi Waqqas, Al-Zubayr bin Al-'Awwam and Abu Obaydah bin AI-Jarrah all flocked to join Muhammad (May God bless him and give him peace). The Prophet once said: ''`Abu Bakr was the only person who accepted Islam immediately, without suspicion. ²³ 

Abu Bakr's occupation was drapery ²⁴ . Adraper, in order to be successful ²⁵  in his trade ²⁶  should not go against his customers' ²⁷  wishes. Nevertheless, he preached  ²⁸ the new religion ardently  ²⁹ without considering how it might affect his business. When the infidels ³⁰  started torturing  ³¹ their poor Muslim slaves ³² , Abu Bakr intervened  ³³ . As he was unable to release ³⁴  them by force, he paid their masters money and set them free. Bilal bin Rabah was one of those who were tortured in the sun, by being brutally ³⁵ whipped  ³⁶  and covered with heavy rocks while lying on the burning sand in the summer heat. When Islam started, Abu Bakr had 40,000 dirhems but by the time he emigrated to Madina he had only 5,000 left.

When the Prophet spoke with contempt of the disbelievers' gods, the infidels got very irritated and attacked him violently when he was on his way to the Ka'ba. Had it not been for Abu Bakr's intervention, something bad might have happened to him.

As the Qurayshites rejected the Prophet's message, he started to look for another tribe ³⁷  which would give him refuge ³⁸  .He was accompanied on this search by Abu Bakr. The only shelter ³⁹  which they could find was in Yathreb, or Madina, which was then inhabited ⁴⁰  by two warring ⁴¹  tribes, the Aws and Khazraj. Later, through the Prophet's good offices, the two tribes became united and were given the name of "Ansar" or "Helpers".

Abu Bakr was known as "Assiddeeq' after the incident on the Prophet's midnight journey  ⁴²  to Jerusalem. The Qurayshites, being experienced ⁴³  merchants ⁴⁴  knew that such a journey, if it ever happened, would take two months by camel. When Muhammad told them he had accomplished his round trip  ⁴⁵ to Jerusalem in one night, they scoffed ⁴⁶  at him and began to doubt his sanity ⁴⁷ . As for Abu Bakr, when he first heard of it he thought that they were telling a tale; he then said, "I have always believed his words about heavenly ⁴⁸  revelation ⁴⁹  how can I disbelieve him about such a secondary wordly matter?"

Because of the ruthless ⁵⁰  torturing of the Prophet's followers, many of them emigrated  ⁵¹  to Abyssinia. Yet Abu Bakr would not leave. He preferred to stay with the Prophet to support  ⁵²  him in his time of need and help the new converts. When many Muslims emigrated to Madina, Abu Bakr asked the Prophet's permission to follow suit. He was told to wait because the Prophet himself might leave with him. So he got two camels ready and waited anxiously  ⁵³ A few days later, while the Prophet's house was besieged  ⁵⁴ by a group of swordsmen ⁵⁵  from all the tribes of Mecca, who had plotted  ⁵⁶ together to kill him, he left his cousin, `Ali bin Abi Talib, in his bed, slipped ⁵⁷  unnoticed from the house, and departed  ⁵⁸ with Abu Bakr in the early hours of the morning. Their journey from Mecca to Madina was full of romance and adventure. As soon as the besieging swordsmen discovered that they were tricked  ⁵⁹ , they went in search of the two men. A public prize of a hundred camels was offered to anyone who might find them. However, it happened that when they hid in a cave named Thawr, a spider spun its web ⁶⁰  at the opening of the cave, and a pigeon built its nest there. The swordsmen followed their tracks until they reached their hiding place, but, seeing the web and the early hours of the morning. Their journey from Mecca to Madina was full of romance and adventure. As soon as the besieging nest, they went home, telling everyone that further pursuit was fruitless ⁶¹  .

Later when the battle of Badr took place between Muslims and non-Muslims, and the latter ⁶²  out numbered the former by three to one, some sort of canopy  ⁶³ was erected  ⁶⁴  for the Prophet at the battle lines. Abu Bakr alone was entrusted  ⁶⁵ with his safety. This shows the very close relationship between the two; and when the Prophet's mantle ⁶⁶  fell from his shoulders during his earnest ⁶⁷  prayer to God, his intimate companion put it courteously  ⁶⁸ back.

In the battle of Ohod, which took place the following year after Badr, the disbelievers ⁶⁹  won the battle because the archers  ⁷⁰ left their places on the top of the mountain. Only a dozen people stayed with the Prophet on this occasion, one of whom was the staunch ⁷¹  believer Abu Bakr.

This loyalty was evident in all the campaigns which the Prophet led, especially those waged ⁷²  against the Jews of Banu Nadier and Banu Qaynoqa', and against the Jews of Fadak, Tayma' and Khaybar, not to mention the heroic battle of the Trench. In fact, from the very start of the Islamic era ^{73 he}  was playing the role of vizier  ⁷⁴  advising and supporting the Prophet.

In the year 6 A.H. the Muslims attempted ⁷⁵  to take Mecca itself, the stronghold  ⁷⁶  of polytheism. When they reached the Hodaybiya Valley, Quraysh sent negotiators ⁷⁷  to persuade them not to attack the city and agreed to let them in for pilgrimage the following year. The Prophet agreed, but some of his followers refused. They were determined to conquer ⁷⁸  Mecca immediately. Abu Bakr stood firmly by the side of the Prophet; but it was only when a full Qur'anic chapter entitled "Fath" or "Conquest" was revealed that they were finally convinced. ⁷⁹ 

When Mecca was at last subdued  ⁸⁰ , all the tribes of Arabia were convinced that Muhammad was a true apostle sent to them by God. They stopped resisting and sent delegates ⁸¹  to Madina proclaiming their allegiance  ⁸² to him. While he was busy receiving delegates, he let Abu Bakr preside over the 300 pilgrims. This incident proved of vital ⁸³  importance later when a caliph was chosen after the death of the Prophet.

The 10th year A.H. was called "the valediction year", because the Prophet, with 100,000 followers, including Abu Bakr and all the Prophet's household ⁸⁴ , performed his last pilgrimage and from the top of `Arafat mountain gave his everlasting ⁸⁵  speech in which he summarized ⁸⁶  the numerous commandments of Islam.

After his return to Madina the Prophet became ill and could not lead the prayers in the Grand Mosque. He gave instructions to 'Aishah' to tell her father to lead the prayers. She pointed out that Abu Bakr's voice was rather low and the worshippers might not hear his recitation  ⁸⁷ of the Qur'an. She also said that he often wept while praying, and suggested Omar bin al-Khattab as being fitter ⁸⁸  for the task  ⁸⁹ .The Prophet became extremely angry, and gave emphatic ⁹⁰  orders that Abu Bakr should lead the prayers. This was taken by the Muslims as another sign to choose Abu Bakr to be their caliph after the Prophet's death.