In his book al-Amali, Sheikh Tusi stated: "The earth will be full of corruption. NO ONE WILL BE ABLE TO SAY, ALLAH. Then Allah, the Exalted, will send a man from me and my family [Hazrat Mahdi (as)]. He will fill the Earth with justice as those who have been before him will have filled it with injustice." (Kitab al-Ghaybah, [Bihar-al Anwar, volume 51], Ansariyan Publishing House, Compiled by: Muhammad Baqr al-Majlis, Iran-Qum, 2003, p. 120.)

In his book al-Amali, Sheikh Tusi stated: "The Earth will become full of oppression and injustice, so much so that NO ONE WILL BE ABLE TO UTTER ALLAH'S NAME BUT SECRETLY. Then Allah will bring a virtuous congregation [Hazrat Mahdi's (as) community], who will fill it with equity and justice, as it will be full of oppression and injustice." (Kitab al-Ghaybah, [Bihar-al Anwar, volume 51], Ansariyan Publishing House, Compiled by: Muhammad Baqr al-Majlis, Iran-Qum, 2003, p. 186.)