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Shiavault - a Vault of Shia Islamic Books The Great Companion of the Prophet (s) Abu Dharr (ra) Chapter 4 Abdul Hamid Jaudatus Sahar of Egypt writes, "Islam spread in Medina like wild fire”. The tribe of Ghifar became overjoyed at it.
Muslims congratulated one another that the two tribes of Aus and Khazraj, who were most eloquent, best swordsmen, and best sympathizers, turned Muslims, and also because Allah had willed to raise up His religion, and was determined to help the Holy Prophet and fulfil His promise. Unais came to his brother Abu Dharr with the happy news and said, "Islam has spread in Medina and Aus and Khazraj have embraced Islam”.
Abu Dharr said, "The Messenger of Allah will go to them and migrate to their city very shortly". Unais looked surprisingly at his brother and said, "Have you received any such information?" Abu Dharr: "No, neither I have any information about it, nor did I know of the people of Yathrib becoming believers".
Unais: "How, then, did you know that the Messenger of Allah will migrate to Yathrib?" Abu Dharr: "He had told me the very day I saw him, that he will go to a town of date palms and I think that place is Yathrib. The Messenger had spoken the truth”. Unais: "Is it possible that his tribe lets him go out of that place along with Muslims, so that after making thorough preparation he may attack them?" Abu Dharr: "They may let him or not, but he will shortly migrate to that place.
Of course, only Allah knows how and when it will happen”. Abu Dharr converted his tribe to Islam after he had become a believer. Then he turned his attention to Medina. Since his return from Mecca, till the migration of the Holy Prophet, Abu Dharr remained busy with the preaching of Islam and continued making efforts to take the Divine religion to the masses. The Holy Prophet kept on doing his duty to preach Islam, and the Quraysh continued to perform their duty of torturing the Prophet.
They gave him so much torture that no alternative was left for him except to leave his home. In short, by the command of Allah, Jibrail asked him to leave Mecca after making Ali sleep in his (Prophet's) bed. He did likewise. He made Ali sleep in his bed and then left, so that the Quraysh might not know that he was not in his bed. After staying for three days in the cave of Hira he set off for Medina. Abu Dharr was anxiously waiting for the migration.