H 487 - It is narrated from Sa'd bin Abdullah from Muhammad bin Isa bin Ubaid from Ismail bin Aban from 'Amru bin Shimr from Jabir al-Ju'fi, he said: I heard Abu Ja'far عليه السلام say: “Umar asked Amirul Mu'mineen عليه السلام saying, ‘Tell me about the Mahdi, what is his name?’ He عليه السلام replied: ‘As for his name, my beloved (the Prophet) has bound me not to speak to anyone about it until Allah raises him.‘ He (Umar) then asked, ‘Tell me about his attributes.‘ He عليه السلام replied, ‘He is a young man of medium height, with a handsome face and beautiful hair, his hair falls on his shoulders, and the light of his face outshines the darkness of his beard and head. By my father, (he is) the son of the best of slave girls.’”