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Shiavault - a Vault of Shia Islamic Books Hayat Al-Qulub Vol.3 Part 3: Imamate is established through the explicit mention Imamate is established through the explicit mention (Nass) of Allah and His Messenger, not through the choice and allegiance of the community (Ummah) It is a must for every Imam to give a Nass (explicit mention) about his successor Imam (who must be obeyed after him). Some arguments about this have been mentioned in the First part.
It must be remembered that the Imamiyah scholars are unanimous on this point that Imam is always appointed by Allah and His Rasool (messenger). The Abbasids say that it is through Nass or Meeraas (inheritance) and the Zaidis say either through Nass or through an invitation given by himself (Imam). All the Ahle Sunnat say that Imam is appointed either through Nass or through the choice of the leading people of the community.
There are many arguments based on logic in favor of the stand of the Imamites: First argument As is known by now that the Imam must be Infallible and Infallibility is an unseen or hidden matter which is known to none but Allah. It is essential that the Nass should be from Allah because only He knows about Infallibility, none else.
Second argument It becomes known by observing the habits of the children of Adam (mankind) and the nature and leanings of the people of the world that when they do not have, over them, a powerful ruler or a strong king who can prevent them from injustice, oppression, lust and such other evils, many people become desirous of suppressing and exploiting the members of their own species and to overpower others through highhandedness and murder etc.
Rather it is necessary that the administration and management of the mankind must be entrusted to a person who may never deviate from the path of welfare, truthfulness and justice and fairplay and who may protect the interests of all in the matter of both this world and the Hereafter in accordance with the Divine Shariat (code of life). So, if Allah does not appoint such an Imam, in every age it would imply that He is pleased with corruption.