Hazrat Mahdi's (as) works of faith-related issues will be instrumental in people attaining salvation in the End Times

Ali ibn Abu Talib says: “The Prophet (saas) said to me in a long will: “O Ali! The most astonishing ones among the people in terms of faith and the greatest people in terms of certitude are those who will come in the End Times. They have never seen the Prophet (saas) and the Imam [Hazrat Mahdi (as)] is hidden from them. THEY HAVE FAITH BY MEANS OF BLACK LETTERS EMBROIDERED ONTO WHITE PAGES (WRITTEN DOCUMENTS).” (Man La Yahzuruhu ‘l-Faqih, Vol. 1, p. 269)

We are told that in the End Times books will be printed with black letters on white pages and that the followers of Hazrat Mahdi (as) will read these books prepared under his leadership. As it is known, Hazrat Mahdi’s (as) followers will not be certain that he is Hazrat Mahdi (as), but they will hold positive thoughts about him because of the portents that can be seen.