The Sufficient (Vol 1) · Hadith 729 (#Ḥadīth #5)
Chapter 59 | Each Imam knows the succeeding Imam The words of Allah, the Most High, “Allah commands you to deliver the trust to its people,”(4:58) is a reference to the Imams
5ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ مُحَمَّدِ بْنِ الْحُسَيْنِ عَنِ ابْنِ مَحْبُوبٍ عَنِ الْعَلاءِ بْنِ رَزِينٍ عَنْ عَبْدِ الله بْنِ أَبِي يَعْفُورٍ عَنْ أَبِي عَبْدِ الله قَالَ لا يَمُوتُ الامَامُ حَتَّى يَعْلَمَ مَنْ يَكُونُ مِنْ بَعْدِهِ فَيُوصِيَ إِلَيْهِ.
5. Muhammad b. Yahya has narrated from Muhammad b. al-Husayn from Ibn Mahbub from al-‘Ala’ b. Razin from ‘Abdallah b. Abi Ya‘fur from Abi ‘Abdillah who has said the following: “The Imam does not die until he learns who the succeeding Imam is so he would deliver his will to him.”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).