Shiavault - a Vault of Shia Islamic Books Uyun Akhbar Ar-Ridha Volume 1 Chapter 13: A Session in the Presence of Al-Ma’mun of Al-Ridha’’s Debate On Unity With Soleiman Al-Marwazi - The Theologian From Khorasan 13-1 Abu Ja’far Muhammad ibn Ali ibn Ahmad - the jurisprudent - may God be pleased with him - narrated that Abu Muhammad Al-Hassan ibn Muhammad ibn Ali ibn Sadaqat al-Qumi quoted on the authority of Abu Amr Muhammad ibn Abdul Aziz Al-Ansari al-Kajji, on the authority of Al-Hassan ibn Muhammad al-Nawfali, “Soleiman al-Marwazi - the most prominent religious scholar in Khorasan went to see Al-Ma’mun.
Al-Ma’mun honored him, granted him gifts and said, “My cousin Ali ibn Musa Al-Ridha’ (a.s.) has come here from Hijaz. He likes theology and theologians.