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

35-2 Al-Hakim Abu Ali Al-Husayn ibn Ahmad al-Bayhaqi narrated that Muhammad ibn Yahya al-Sowli quoted on the authority of al-Mobarrid, on the authority of al-Riashi, on the authority of Abu Asim who quoted on the authority of Ar-Ridha’ عليه السلام that Musa ibn Ja’far عليه السلام once spoke well to his father عليه السلام. His father عليه السلام said, “O my son! Praise be to God who designated you to be the successor of your forefathers, and as a source of pleasure among my children, and in return for my lost friends.”