Kitāb al-Ghayba > Refutation of all sects, which believed in Imamate of someone other than Master of the Age (a.s)
Hadith #1

وأما من خالف من الفرق الباقية الذين قالوا بإمامة غيره كالمحمدية الذين قالوا بإمامة محمد بـن عـلي بـن محمـد بن عـلي الرضـا عليه السلام والفطحية القائلة بإمامة عبد الله بن جعفر بن محمد الصادق عليه السلام وفي هذا الوقت بإمامة جعفر بن علي. وكالفرقة القائلة أن صاحب الزمان حمل لم يولد بعد. وكالذين قالوا أنه مات ثم يعيش. وكالذين قالوا بإمامة الحسن عليه السلام وقالوا هو اليقين ولم يصح لنا ولادة ولده فنحن في فترة. فقولهم ظاهر البطلان من وجوه: أحدها انقراضهم فإنه لم يبق قائل يقول بشي‏ء من هذه المقالات ولو كان حقا لما انقرض. ومنها أن محمد بن علي العسكري مات في حياة أبيه موتا ظاهرا.والأخبار في ذلك ظاهرة معروفة من دفعه كمن دفع موت من تقدم من آبائه عليهم السلام.

The other groups that have disagreed and professed the Imamate of someone else – such as Muhammadiyya, who believed in the Imamate of Muhammad Ibn Ali Ibn Muhammad Ibn Ali Imam Ridha (a.s); and the Fathiyya, who believed in the Imamate of Abdullah Ibn Ja’far Ibn Muhammad Imam Sadiq (a.s) and proclaim the Imamate of Ja’far Ibn Ali at this time; and like the denomination that believes that the Master of the Age has been conceived, but is not born yet; and like the ones who believed that he has died and then he will live again; and like those who believed in the Imamate of Imam Hasan Askari (a.s) and claimed that his Imamate is certain and the birth of his son has not been proved and that we live in a time with no Imam; their words are very obviously false for a number of reasons. One of these reasons is their extinction. There is no one left today who believes in these doctrines anymore; and if they had been correct, they would not have perished. Another reason is that Muhammad Ibn Ali Askari died during the lifetime of his father. His death was well-known and traditions regarding it are evident and famous. Anyone who rejects them is like someone who rejects the death of anyone of his forefathers, peace be on them.