Historically it is an established fact that it was Yahya who...

Historically it is an established fact that it was Yahya who misinformed al-Rasheed about Imam Musa bin Ja'far (a.s.), and he himself ordered al-Sindi to add poison to the food of the Imam. In addition, Imam al-Ridha (a.s.), the son of Imam Musa bin Ja'far (a.s.), blamed the Barmecides for the death of his tather and he prayed for their destruction. Then it is incorrect to say that Yahya was a follower. in secret. of Imam Musa Kadhim (a.s.). Allamah al-Majlisi, Ibid., p. 231.