It is narrated on the authority of Yahya b. Ya'mur that the first man who discussed qadr (Divine Decree) in Basra was Ma'bad al-Juhani. I along with Humaid b. 'Abdur-Rahman Himyari set out for pilgrimage or for 'Umrah and said:
Should it so happen that we come into contact with one of the Companions of the Messenger of Allah (peace be upon him) we shall ask him about what is talked about taqdir (Divine Decree).
According to the Quran, the Prophet (pbuh) is responsible for tabligh (delivering the message): "O Messenger, proclaim the (message) which hath been sent to thee from thy Lord. If thou didst not, thou wouldst not have fulfilled and proclaimed His mission. And Allah will defend thee from men (who mean mischief). For Allah guideth not those who reject Faith." (Al-Maida 5/67). "The Messenger's duty is but to proclaim (the message). But Allah knoweth all that ye reveal and ye conceal" (Al-Maida 5/99).
The primary reason for the success of the Prophet in calling people to Islam in the Arabian Peninsula in such a short time was its emphasis on education. This call gave new life to people. The Prophet reached the hearts and minds of people through educational activities. He helped people to feel more human. When people learned the qualities of Islam and witnessed how individuals who became Muslim were transformed, they accepted the invitation of the Prophet.