 ٣ـ وَبِهَذَا الاسْنَادِ عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ قَالَ حَدَّثَنِي أَبُو عَلِيٍّ الارَّجَانِيُّ الْفَارِسِيُّ عَنْ عَبْدِ الرَّحْمَنِ بْنِ الْحَجَّاجِ قَالَ سَأَلْتُ عَبْدَ الرَّحْمَنِ فِي السَّنَةِ الَّتِي أُخِذَ فِيهَا أَبُو الْحَسَنِ الْمَاضِي (عَلَيْهِ السَّلام) فَقُلْتُ لَهُ إِنَّ هَذَا الرَّجُلَ قَدْ صَارَ فِي يَدِ هَذَا وَمَا نَدْرِي إِلَى مَا يَصِيرُ فَهَلْ بَلَغَكَ عَنْهُ فِي أَحَدٍ مِنْ وُلْدِهِ شَيْ‏ءٌ فَقَالَ لِي مَا ظَنَنْتُ أَنَّ أَحَداً يَسْأَلُنِي عَنْ هَذِهِ الْمَسْأَلَةِ دَخَلْتُ عَلَى جَعْفَرِ بْنِ مُحَمَّدٍ فِي مَنْزِلِهِ فَإِذَا هُوَ فِي بَيْتٍ كَذَا فِي دَارِهِ فِي مَسْجِدٍ لَهُ وَهُوَ يَدْعُو وَعَلَى يَمِينِهِ مُوسَى بْنُ جَعْفَرٍ (عَلَيْهِ السَّلام) يُؤَمِّنُ عَلَى دُعَائِهِ فَقُلْتُ لَهُ جَعَلَنِيَ الله فِدَاكَ قَدْ عَرَفْتَ انْقِطَاعِي إِلَيْكَ وَخِدْمَتِي لَكَ فَمَنْ وَلِيُّ النَّاسِ بَعْدَكَ فَقَالَ إِنَّ مُوسَى قَدْ لَبِسَ الدِّرْعَ وَسَاوَى عَلَيْهِ فَقُلْتُ لَهُ لا أَحْتَاجُ بَعْدَ هَذَا إِلَى شَيْ‏ءٍ.
 3. Through the same chain of narrators it is narrated from Ahmad ibn Muhammad who has said the following. “Abu Ali al-Arjani al-Farisi narrated to me from ‘Abd al-Rahman al- Hajjaj in the year ( 179 AH /795 AD) in which former abu al-Hasan, Imam Musa  was detained. I (Hajjaj) said to him (‘Abd al-Rahman), “This man (abu al-Hassan Musa  has been detained in his (Mansur, current ruler) hands. We do not know how his conditions are. Have you heard anything from him about his sons?” He (‘Abd al-Rahman) said to me, “I did not think anyone would ask me about this issue. Once I went to see Ja‘far ibn Muhammad  in his home. He was in such and such a room at the prayer area. He was praying to Allah and on his right side was Musa ibn Ja‘far  saying Amen for his prayer. I said to him, ‘May Allah take my soul in service for your cause, you know my having cutoff from all others to serve you, who will be the Wali Leader with Divine Authority for people after you?” He replied, “Musa has dressed up in this coat of arms and it has perfectly fitted him.” I then said to him, “I will not need anything after this.”