الكافي 1/4/74/1

1. Ali ibn Ibrahim has narrated from his father that ’Isma‘il ibn Mihran who has said the following. “When abu Ja‘far عليه السلام left Madina for Baghdad the first time of his two journeys on his leaving I said to him, “May Allah take my souls in service for your cause, I am afraid about you in this condition. To who, after you, will belong the task (Leadership with Divine Authority)?” He turned to me laughing and said, “The disappearance, as have thought, will not take place this year. When he was about to be taken to al-Mu‘tasam (179/795 —became caliph 218/833 — 227/841), for the second time I went to him and said, “May Allah take my souls in service for your cause. You are leaving. To who, after you, will go this task Leadership with Divine Authority)?” He wept until his beard become soaked. He then turned to me and said, “This time you should be afraid about my life. The task (Leadership with Divine Authority) after me will go to my son Ali عليه السلام .”