Shia Hadith about the time of Mahdi’s rise disproves the concept of 12 Imams.
Imam said: Allah (t) had set a time for this Order in 70 AH, but when al-Husayn (as) was killed, Allah’s (t) anger with the people of the Earth intensified. So He delayed it till 140 AH, and we narrated to you [regarding it] and you publicized the narration, so the secret was disclosed. Allah thereafter has not set any time for it that we know of. And, “Allah erases what He wills and establishes [what He wills]; and with Him is the Original Book” (13:39). [Al-Kafi. Bilal Muhammad’s grading: “mursal kal-sahih”.]
The narration refers to the time in which the Mahdi was supposed to rise to spread justice. Originally, he was going to appear in the year 70, however, allegedly, that timing has been pushed back due to the sins of man.
Significance of the report:
– it nullifies all earlier reports that speak of Imams after Al-Hussain, including the reports of Sulaym.
– it contradicts the Sunni hadith of Jabir bin Samura that there will be Twelve caliphs.
– it implies that Allah doesn’t know the future.
Taken from brother Farid’s twitter post.