الكافي 1/4/68/2

2. A number of our people has narrated from Ahmad ibn Muhammad from al-Husayn ibn Sa‘id from ibn Sinan from abu al-Jarud from abu Ja‘far عليه السلام who has said the following. “When al-Husayn عليه السلام was about to leave this world he gave his directive will to his daughter, Fatima in a sealed document before the people onpenly. When what had to happen to al-Husayn عليه السلام did happen she gave it to Ali ibn al-Husayn (a.s..” The narrator has said that then he asked the Imam عليه السلام . “What was in it, may Allah grant you blessings?” The Imam عليه السلام said, “It contained all that the children of Adam would need from the beginning of the world until it will end.”