Nomination of Imam(a.s)

It is narrated in Kitab Al-Irshad by Shaykh Al-Mufeed(a.r) that Ali b.Jafar said: God gave Abul Hasan Al-Reza(a.s) victory when his brothers and uncles treated him unjustly.[Then he gave a long account until he came to:] (i.e Ali b.Jafar) arose and seized the hand of Abu Jafar Muhammad b. Ali Al-Reza and I said to…