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Shiavault - a Vault of Shia Islamic Books The Life of Muhammad The Prophet Islam Spreads The fall of Mecca was the signal for an unprecedented rush to accept Islam. As 'Amr ibn Salamah, a foster son and companion of the Prophet, stated: "The Arabs were waiting for the Quraish to accept Islam. They used to say that Muhammad (s.a.w.a.) must be left to his people. If he would emerge victorious over them, he is undoubtedly a true prophet.
When Mecca was conquered, all the tribes hastened to accept Islam." Zakah collectors were sent into the territories that came under the Muslims' control. These officials not only demonstrated great fairness in collecting the zakah and jizyah, but also preached effectively to the people, for most of them were pious and God-fearing people.
After the fall of Mecca, teachers were sent in all directions to bring the people to God's way, and they met with so much success that hosts upon hosts flocked to the Prophet. It is about such mass conversions that the Qur'an has stated: When there comes assistance from Allah and victory, and you see men entering the religion of Allah in companies. (Qur'an, 110:1-2). After the order was issued prohibiting the polytheists from entering the Sacred Mosque, the entire Hijaz was Muslim.
By the 10th of Hijra, the influence of Islam had reached Yemen, Bahrain, Yamama, Oman, Iraq, and Syria. The Chief of the Daws, a tribe in Yemen, had accepted Islam even before the emigration. In 8 A.H., Khalid was sent to Yemen to preach Islam but could not make much headway. Then 'Ali went there and read the epistle of the Prophet; the entire tribe of Harridan accepted Islam. In 10 A.H., Wabr was deputed to contact the leading Persians residing in Yemen.
Firoz Dailami, Markabood and Wahb ibn Munabbih accepted Islam through him. Ma'adh ibn Jabal and Abu Musa al-Ash'ari were also sent to Yemen with the following instructions: "Be polite, not harsh; give glad tidings to the people and condemn them not. Work together. When you meet people who already follow some religion, preach to them about the Oneness of God and (my) Messengership; if they accept, tell them that God has enjoined prayers five times in a day and night.
If they agree to do so, tell them that zakah is also obligatory upon those who can afford to pay in order to help the poor. If they give zakah do not pick out only things of better quality.