Saʿd b. ʿAbd Allāh, from al-Ḥasan b. ʿĪsā b. Muḥammad b. ʿAlī b. Jaʿfar, from his father, from his grandfather Muḥammad b. ʿAlī, from ʿAlī b. Jaʿfar, from his brother, Mūsā b. Jaʿfar عليهما السلام, who said: “When the fifth of the seventh’s offspring has become unaccounted for, then for Allāh’s sake, maintain your religious commitments! Do not let anyone turn you away from them. O’ sons of mine, it is necessary for the Master of this Ordinance to undergo an occultation such that he who affirmed this Ordinance will recant his affirmation. It is only a tribulation from Allāh عز وجل by which He tests His creatures. Had your forefathers and ancestors known of a religion more correct than this one, they would have followed it.” I (ʿAlī b. Jaʿfar) asked: “O’ my master, what is the fifth of the seventh’s offspring?,” to which he responded: “O’ sons of mine, your intellects are too feeble for that, and your forbearances are too constricted to bear it. But if you live, you will encounter it.”