The Source of Traditions on Imam al-Riḍā (Vol 2) · Hadith 400 (#Ḥadīth #10)
Chapter 5 | On What Ar-Ridha Wrote for Al-Ma’mun Regarding Pure Islam and the Religious Decrees
10 - حَدَّثَنا الْحاكِم أَبُو عَلِي الحُسَيْنِ بْنِ أحْمَدالْبِيْهَقِيُّ قالَ: حَدَّثَنا مُحَمَّدِ بْنِ يَحْيَى الصُّوليُّ قالَ: حَدَّثَنا أَبُو ذكوان قالَ: حَدَّثَنا إِبْراهيمِ بْنِ العَبَّاسِ قالَ سَمِعْتُ عَلِىِّ بْنِ مُوسَى الرِّضا a.sُ يَقُولُ: مودّةُ عِشْرِينَ سِنَةَ قَرابَة وَالعِلْمُ أجمع لأهله من الآباء.
35-10 Al-Hakim Abu Ali Al-Husayn ibn Ahmad al-Bayhaqi narrated that Muhammad ibn Yahya al-Sowli quoted on the authority of Abu Thakwan, on the authority of Ibrahim ibn Al-Abbas that he had heard Ali ibn Musa Ar-Ridha’ say, “Two decades of friendship will cause close ties, and knowledge will bring about more for its possessor than what his parents might leave for him.”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).