The Source of Traditions on Imam al-Riḍā (Vol 2) · Hadith 428 (#Ḥadīth #13)
Chapter 10 | On The Reasons why Ali ibn Musa Ar-Ridha accepted the succession to the throne from Al-Ma’mun, what Went On, those who were displeased and those who were pleased
13 - حَدَّثَنا الْحاكِم أَبُو عَلِي الحُسَيْنِ بْنِ أحْمَدالْبِيْهَقِيُّ قالَ حَدَّثَني مُحَمَّدِ بْنِ يَحْيَى الصُّوليُّ قالَ: حَدَّثَنا المغيرة بْنِ مُحَمَّد قالَ: حَدَّثَنا هـارُون الفروي قالَ لَمَّـا جَـاءَتْنَا بَيْعَةُالْمَأْمُونِ لِلرِّضَا a.sُ بِالْعَهْدِ إِلَى الْمَدِينَةِ خَطَبَ بِهَا النَّاسَ عَبْدُ الْجَبَّارِ بْنُ سَعِيدِ بْنِ سُلَيَْمانَ الْمُسَاحِقِيُّ فَقَالَ فِي آخِرِ خُطْبَتِهِ أَتَدْرُونَ مَنْ وَلِيُّ عَهْدِكُمْ هَذَا عَلِيُّ بْنُ مُوسَى بْنِ جَعْفَرِ بْنِ مُحَمَّدِ بْنِ عَلِيِّ بْنِ الْحُسَيْنِ بْنِ عَلِيِّ بْنِ أَبِي طَالِبٍ a.sُ:سَبْعَةُ آبَاؤُهُمُ مَنْ هُمْأَخْيَرُ مَنْ يَشْرَبُ صَوْبَ الْغَمَام
40-13 Al-Hakim Abu Ali Al-Husayn ibn Ahmad al-Bayhaqi narrated that Muhammad ibn Yahya al-Sowli quoted on the authority of Al-Mogheera ibn Muhammad, on the authority of Harun Al-Farawi, “When the news ofAr-Ridha’’s successorship to the Throne of Al-Ma’mun reached us in Medina, Abdul Jab’bar ibn Sa’eed ibn Soleiman al-Mosahaqi declared it to the people at the end of his sermon. He said, “Do you realize who the successor to the throne is? They said, “No.” He said, “It is Ali ibn Musa ibn Ja’far ibn Muhammad ibn Ali ibn Al-Husayn ibn Ali ibn Abi Talib .Seven forefathers - what ancestorswho are the best to drink in the direction of the clouds.”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).