الكافي 1/4/125/19

19. Ali ibn Muhammad has narrated from al-Hassan ibn ‘Isa al-‘Uraydi abu Muhammad who has said the following. “When abu Muhammad عليه السلام passed away a man from Egypt came to Makk with a certain amount of commodities that were due to the holy location (office of the Imam عليه السلام People expressed different opinions on the issue. Certain persons said, “Abu Muhammad عليه السلام has passed away and has left no one behind as his successor. Ja‘far is his successor. Others said, “Abu Muhammad عليه السلام passed away and he left his successor behind.. A man called abu Talib was sent to the army camp (the city of Surra man Ra’a) with a letter. He went to see Ja‘far and ask him for the evidence to prove that he is the successor of abu Muhammad عليه السلام , Ja‘far said, “It is not available at this time.” He then went to the door and gave the letter to our people and the response that came said, “We present our condolences to you for the death of your friend (the man from Egypt). He has died and he has a will in which he said that the commodities must be given to the trust worthy person to deal with in a proper manner. His letter was answered. When came back to Makka it was just the way he was informed by the holy location (the office of the Imam عليه السلام “