Hadith 4-1

حَدَّثَنا أَبي رَضِىَ اللهُ عَنْهُ قالَ: حَدَّثَني الحَسَنُ بْنُ عَبْدِاللَّه بْنِ مُحَمَّدِ بْنِ عِيسَى، عَنْ أَبيهِ، عَنْ الحَسَن بْنِ مُوسَى الخَشَّاب، عَنْ مُحَمَّدِ بْنِ الأَصْبَغِ، عَنْ أَحْمَدَ بْنِ الحَسَن المِيْثَمي - وَكانَ واقِفِيّاً - قالَ: مُحَمَّدِ بْنِ إِسْــمَاعِيل بْنِ الفَضْلِ الهاشِــمي، قالَ: دَخَلْتُ عَلَى أَبي الحَسَن مُوسَى بْنِ جَعْفَرعَلَيْهِمَا السَّلاَمُ وَقَدْ اشْتَكى‏ شَكاةً شَدِيدَةً، فَقُلْتُ لَهُ: إِنْ كانَ ما أَسْأَلُ اللَّه أَن لا يُرْيَناهُ فَإَلى‏ مَنْ ؟ قالَ: إِلى عَلِيٍّ اِبْنِي، وَكِتابُهُ كِتابي، وَهُوَ وَصِيِّي وَخَلِيفَتِي مِنْ بَعْدي.

(The author of the book narrated) my father - may God be pleased with him - narrated that Al-Hassan ibn Abdullah ibn Muhammad ibn Isa quoted on the authority of his father, on the authority of Al-Hassan ibn Musa al-Khashshab, on the authority of Muhammad ibn al-Asbaq, on the authority of Ahmad ibn Al-Hassan al-Maysami - who was one of the Waqifites [1] quoted on the authority of Muhammad ibn Isma’il ibn Al-Fadhl al-Hashemi, “I went to see Imam Musa Al-Kazim (a.s.) when he was seriously ill. I asked him: If God forbid something should happen to you, whom should we follow? He said, “Follow my son Ali (Imam al-Ridha’). His writing is my writing. He is my Testamentary Trustee, and my successor after me.