Muḥammad b. al-Ḥasan al-Ṣaffār said: “Muḥammad b. al-Ḥusayn b. Abī’l-Khaṭṭāb and Muḥammad b. ʿĪsā b. ʿUbayd al-Yaqṭīnī altogether narrated to us, from ʿAbd al-Raḥmān b. Abī Najrān, from ʿĪsā b. ʿAbd Allāh b. Muḥammad b. ʿUmar b. ʿAlī b. Abī Ṭālib, from his maternal uncle al-Ṣādiq, Jaʿfar b. Muḥammad عليهما السلام. ʿĪsā al-ʿAlawī narrated: “I said to him: “If something were to happen—may Allāh not let me see your day—who would I take as my Imam?” He nodded in the direction of Mūsā عليه السلام. I continued: “If Mūsā were to die, then to whom?” He said: “To his son.” I said: “If his son were to die, and leave behind a brother who is older and a son who is younger, who do I take as my Imam?” He said: “His son.” Then, he said: “It will always be as such.” I followed up with: “If I am not cognisant of him, nor do I recognise his whereabouts, what am I to do?” He responded: “You say: O’ Allāh, I seek to take as authority over me whoever remains of Your Divine authorities from among the posterity of the late Imam, for that will suffice you.” This has also been transmitted by way of Saʿd and al-Ḥimyarī, from Ibn Abī’l-Khaṭṭāb, from Ibn ʿUbayd.