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Shiavault - a Vault of Shia Islamic Books Leading The Ummah Chapter 10:Let Us Be Fair In Our Judgments The only caliph who was elected with the unanimous votes of the immigrants (Muhajirin and Ansar) was Imam Ali (as). In the history of the Islamic caliphate, this was a unique and unprecedented occurrence, which never repeated itself again.
When Muawiyyah (who had established the foundation of his empire in Syria and had severe enmity towards the Prophet's household) became aware of the fact that the Muhajirin and Ansar had elected Imam Ali (as) as the caliph, he became extremely agitated and had no intention of allying with the Imam. He not only avoided entering into allegiance with the Imam, he accused the Imam of having participated in the death plot against Othman and of supporting Othman's assassins.
In order to silence him, Imam Ali (as) in one of his letters to Muawiyyah wrote that the individuals who had entered into allegiance with Abu Bakr, Omar and Othman had also done so with him (Imam Ali). He also added that if Muawiyyah respected those caliphs, then he had to respect the Muhajirin and Ansar's votes in electing him (i.e. Imam Ali). Now let us refer to the letter “The same individuals who had allied with Abu Bakr, Omar and Othman have entered into allegiance with me.
Thus, everyone is free to vote for another Imam. The Muhajirin and Ansar are permanent members of the council so their election for any person as Imam will be acceptable to God and will satisfy Him”. Imam Ali's objective in writing this letter was to silence Muawiyyah and to close the door to his further rationalization. Muawiyyah used to be the province governor during Omar's caliphate. He later accepted such a post in Syria under Othman.
Muawiyyah used to call them God's caliphs and himself as their representative. If the election of the previous caliphs was supposed to be legal, then Imam Ali's election must have had the same legitimacy. Imam Ali (as) condemned Muawiyyah's disagreement with his caliphate and started in the following manner: Those who allied with Abu Bakr, Omar and Othman have allied with me. Then why would you not consider my caliphate legitimate?
The very essence of his dispute is to condemn the opponent with the issues the opponent consider respected and honorable. This letter does not approve the election of a caliph through the council of Muhajirin and Ansar. Imam(as) believes that the role of Imamate is not appointed; rather it is an issue of election.