Musa Ibn Ja’far Baghdadi said, “I heard from Imam Hassan Askari (PBUH) (11th Imam of Shia) who said, ′I see that after me differences will appear among you concerning the Imam after me. Whoso accepts the Imams after the Prophet of Allah but denies my son (Imam Mahdi), is like the person who accepts all the prophets but denies the prophet hood of Muhammad (PBUH), the Prophet of Allah. And whoso denies “Muhammad” (PBUH) the Prophet of Allah, is like one who has denied all the prophets of Allah, obeying the last of us is like obeying the first and denying the last of us is like denying the first. But beware! Verily for my son there is an occultation during which all people will fall into doubt except those whom Allah protects.”

It is unquestionable that the idea of Imam Mahdi (PBUH) was projected upon several Imams in turn, but it could take definite shape only around the person of the twelfth, with whom the purpose of Imamate will be fulfilled. There is a considerable body of literature about him, both in Persian and in Arabic. The sources of this literature have been assembled by Saffar al-Qummi, reporter-witness of Imam Hassan Askari (PBUH); al-Kulayni and his follower al-Nu’mani, fourth/tenth century; Ibn Babuyah, who owed his information to a contemporary witness, Hassan Ibn Muktib; al-Shaykh al-Mufid; Muhammad Ibn Hassan Tusi. The principal traditions are collected in volume 13 of Al-Majlisi’s Encyclopedias.

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text reference : islampfr.com

photo reference : siavash313.mihanblog.com