If you are stepping down...
If you are stepping down, then step down so I will be the Caliph; otherwise, I will not participate in this council.’ The meaning of his participation in that council was that he dispersed his explicit and definite right and placed himself among the people in the council. Your situation is now similar to that of ‘Ali ibn Abi Talib’s situation. This was the rational aspect of the story. But the threat aspect, ‘Umar was a caliph whose actions were regarded almost as evidence for the time and age.
Ma’mun was trying to say if I make a rigorous decision, society will accept it and would say he made the same decision the second Caliph made. He said, ‘The Muslim interest lies in the council and if anyone violates it, behead him. And I give this order upon the decree that I am the Caliph and I say it is to the best interest of Muslims that ‘Ali ibn Musa accepts the heir-apparency and if he disobeys I will behead him because I am the Caliph.’ He mixed logic and threat.
Therefore, another one of the historical facts is that Imam al-Ridarefused to accept to be Ma’mun’s crown prince but later agreed because of Ma’mun’s threats. The third issue which is again among definite historical facts is that from the beginning, the Imam set a condition for Ma’mum which was I will not interfere in anything meaning practically I do not want to be a part of this system whether under the title of ‘crown prince’ or not.
They can make coins in my name if they want to, read sermons in my name if they want to, but do not involve me in any job practically. I do not want to interfere in judgements or the administration of justice nor in any removals from or appointments to a position or any other job.2 In that same formal ceremony (for his crown prince position), the Imam behaved in such a way which proved his separation from Ma’mun’s system.
In my opinion, the first sentence he read in his first ‘crown prince’ speech is very amazing and valuable.
Ma’mun prepared that great ceremony and invited all the heads of the country including the ministers, the army heads and other figures to all participate with green clothes that was the slogan they set then.3 The first person he ordered to come and give oath of allegiance to Imam al-Ridaas the crown prince was his son ‘Abbas ibn Ma’mun who was apparently the previous crown prince or the candidate for this position. They all then came one by one and gave oath of allegiance.