3 - Narrated to us my father and Muhammad bin Hasan - May Allah be pleased with them – they said: Narrated to us Saad bin Abdullah from Muhammad bin Isa bin Ubaid from Ismail bin Aban from Amr bin Shimr from Jabir bin Yazid Jofi that he said: I heard Aba Ja’far say: “Umar asked Amirul Momineen about the Mahdi: O Ibne Abi Talib tell me about the Mahdi, what his name is? He replied: As for his name; I cannot tell you that. Indeed my dearest one and my friend has taken oath from me not to mention his name till Allah, the Mighty and Sublime does not raise him and these are from the matters that Allah, the Mighty and Sublime has given to His Messenger in his knowledge.”