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Shiavault - a Vault of Shia Islamic Books The Life of Imam Musa Bin Ja'far Al-kazim Chapter Viii At the Time of al-Saffah Kufa received the pledge of allegiance to Abu al-'Abbas al-Saffah with much silence out of fear, many worries and disorders. That is because the Umayyad government was still standing and controlling most Islamic regions.
Meanwhile the Umayyad king was camping on the bank of al-Zaab River along with a great army composed of over one hundred thousand horsemen from the Arab Peninsula, Syria, and Mousil; whereas the 'Abbasid Caliph had no forces except those in Khuresan and its outskirts and Kufa. Neither Basrah nor Wasit entered the frame of the pledge of allegiance (to him), as well as the summons to the caliphate was to al-Rida from among the family of Muhammed, and the 'Abbasids were not mentioned.
That is because the masses struggled for the 'Alawids, who were the first pillar for social justice and the guarantee of the interests of the community. None thought that the 'Abbasids would assume the caliphate, for the souls were full of doubts about them. That is because some of them were famous for treachery and treason toward the community during its most critical conditions and hours. An example of them is 'Abd Allah b. al-'Abbas.
He betrayed Allah and His Apostle when he joined the camp of Mu'awiya in the dark night. That was after he had taken a bribe to desert (Imam al-Hasan), the grandson of the Prophet, may Allah bless him and his family. The thing that made the Muslims increased their doubt about them is that they submissive to the Umayyad government throughout its periods of time and performed no positive deed in resisting the tyranny and oppression of the Umayyads.
Any way, Kufa received the procession of Abu al-'Abbas al-Saffah on Friday, Rabi' al-Awal 12, 132 A. H. when he was heading for the Mosque. After he had performed the prayer, Abu al-'Abbas al-Saffah went up on the pulpit, though he was ill, and delivered an eloquent, wonderful sermon in which he lauded the 'Abbasids, saying: O People of Kufa, you are the place of love for us and the house of affection toward us.