Ikmaaluddin: Shaykh Saduq (r.a.) has narrated from his father from Saad from Ibne Abil Khattab from Ibne Yazi from Abdullah Asim from Husain bin Mukhtar Qalanasi from Abdur Rahman bin Siyabah that Imam Ja’far Sadiq (a.s.) said:
“What will be your condition at that time when you shall be without an Imam or guide [Mahdi] and you will be disgusted with each other? At that time you shall be severely examined and you shall be differentiated and sieved. There will be famines. A person will become a ruler in the morning and put to death in the evening.”
[The Promised Mahdi, Allamah Muhammad Baqir al-Majlisi, Biharul Anwar, Volume 13 (Old Edition)/Volumes 51-52-53 (New Edition)]