This matter is indicated clearly in a dialogue between Imam...

This matter is indicated clearly in a dialogue between Imam ar-Ridha ( ‘a ) and some followers of Waqifiyyah: ‘Ali ibn Abi Hamzah who was a Waqifi asked Imam ar-Ridha ( ‘a ): “What happened to your father?” The Imam replied: “He passed away.” Ibn Abi Hamzah said: “Whom did he appoint as the successor after him?” The Imam answered: “It is me.” He said: “So, are you the Imam ought to be obeyed?” The Imam responded: “Yes.” Ibn Siraj and Ibn Makari (two other Waqifis) inquired: “Has your father determined it for you?” Imam ar-Ridha ( ‘a ): “Woe to you!

There is no need for me to say, ‘He has designated me.’ Do you like me to go to Baghdad and say to Harun, ‘I am the Imam ought to be obeyed’? By God! I do not have such a…