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Shiavault - a Vault of Shia Islamic Books Uyun Akhbar Ar-Ridha Volume 1 Chapter 1: Why Is Ali Ibn Musa (a.s.) Called Al-Ridha’ The author of this book (a.s.heikh Sadooq) lived in Ray. He was a jurisprudent whose name was Abu Ja’far Muhammad ibn Ali ibn Husayn ibn Musa ibn Babwaih al-Qumi, a resident of Ray - may God help him in obedience of God, and grant him success in His gratification.
1-1 My father, Muhammad ibn Musa ibn al-Motawakkil, Muhammad ibn Ali ibn Majiluwayh, Ahmad ibn Ali ibn Ibrahim ibn Hashem; Al-Husayn ibn Ibrahim Natanat; Ahmad ibn Ziyad ibn Ja’far al-Hamadani; Al-Husayn ibn Ibrahim ibn Hisham al-Mokattib, and Ali ibn Abdullah - may God be pleased with them all - narrated that Ali ibn Ibrahim ibn Hashem quoted on the authority of his father that Ahmad ibn Muhammad ibn Abi Nasr al-Bezanti told Abi Ja’far Muhammad ibn Ali ibn Musa (a.s.), “Some of your opponents think that Al-Ma’mun called your father Al-Ridha’ (a.s.) that means ‘acceptable’ or ‘liked’ since he liked your father and chose him to be his crown-prince.
Imam Al-Jawad (a.s.) said, “No, by God, they are liars. God the Almighty the Sublime named him Al-Ridha’ (a.s.) since he was accepted by God the Almighty in His Heavens[^1], and he was accepted by his Prophet (S) and the Imams (a.s.) that followed the Prophet (S) on His Earth.” Al-Bezanti said, “Were not your father and grandfathers accepted by God, the Prophet and the Imams?” Imam Al-Jawad (a.s.) said, “Yes, they were.” He then asked, “Why then only was your father called Al-Ridha’ and they were not?” Then Imam Al-Jawad (a.s.) said, “That is because his friends and followers as well as his opponents accepted him, while this was never the case for my forefathers.