From Guardianship of Ali ibn Abi Talib (A.S) to return of Imam Mahdi (A.J) by Mohammad Saeid Taheri Moosavi* Before his death and in different positions, the Messenger of God (PBUH) emphasized on his successorship and introduced Imam Ali (A.S) as his successor. Of course, the most important announcement of his succession, took place during the last Hajj pilgrimage, on the 18th of Dhul-Hijjah in the year 10 AH in …