Al-Ghaybah al-Nomani: HE [MAHDI (PBUH)] WILL BE PAID ALLEGIANCE TO RULE OVER THE PEOPLE WITH A NEW METHOD, NEW PRINCIPLES AND A NEW RULE DETERMINED BY THE HEAVENS. None of his armies will be defeated until he dies.”
(The Awaited Mahdi, Allamah Muhammad Baqir el-Majlisi, Bihar al-Anwar, Vol. 13 (Old edition)/ Vol. 51-52-53 (New edition); Kitab al-Ghaybah, Imam Mahdi - The Twelfth Imam, Chapter II, Translator, Sayyid Athar)