When Rasulullah was forty years old, an angel appeared in the cave of Hira and commanded him three times to 'Read'. Rasulullah replied that he could not. The angel then recited the following verses as the first revelations of the Quran then disappeared:
This Divine incident so affected Rasulullah
that he hurried home and he related the incident to Hazrat Khadeejah (R.A.)
When Rasulullah said he was afraid for his life, Hazrat Khadeejah (R.A.) comforted him and said 'you should feel happy. Allah will never let you down because you have been loving, helpful, truthful, and you are 'Fair'.
After this granting of apostleship, Rasulullah
began to preach Islam. The first man to become a Muslim was his closest
friend Hazrat Abu Bakr (R.A.) and first women was his beloved wife Hazrat
Others who became Muslims willingly were Hazrat Ali-ibn-Abu Taalib (R.A.), the young cousin of Rasulullah , and Hazrat Zaid-bin-Harith (R.A.) the freed slave of Rasulullah.
Contents of the biography of the Prophet Muhammed