On What Ar-Ridha عليه السلام Wrote for Al-Ma’mun Regarding Pure Islam and the Religious Decrees

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’ عليه السلام 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.”