H 169 - Saad bin Abdullah has narrated from Muhammad bin Ahmad Alawi from Abu Hashim Dawood bin Qasim Ja’fari that he said: I heard Imam Hadi عليه السلام say: The successor after me is Hasan. But how will it be for you with regard to the successor after the successor? I asked: May I be sacrificed on you, what for? He replied: Because you will not see his person, nor is it permissible for you to mention him by his name. I asked: So how are we to mention him? He replied: The Proof (Hujjah) from Aale Muhammad عليه السلام.