Saʿd b. ʿAbd Allāh said: “Al-Ḥasan b. Mūsā al-Khashshāb narrated to us from Isḥāq b. Muḥammad b. Ayyūb, who narrated: “I heard Abā’l-Ḥasan ʿAlī b. Muḥammad b. ʿAlī b. Mūsā عليه السلام saying: “The Master of this Ordinance is he about whom people will say: “He has not yet been born.”