One day Al-Ma’mun told Ar-Ridha’ (a.s.), ‘O Abal Hassan Al-Ridha’ (a.s.)! Tell me, why is it that your grandfather Ali - the Commander of the Faithful (a.s.) became the one to divide up Paradise and Hell. What is meant by this? I have thought a lot about this.” Then Ar-Ridha’ (a.s.) told him, “O Commander of the Faithful (i.e. Al-Ma’mun)! Has it not been narrated by your father, on the authority of your forefathers, on the authority of Abdullah ibn Abbas to have said that he had heard God’s Prophet (S) say, “Liking Ali is the same as faith, and despising him is the same as atheism.” Al-Ma’mun said, “Yes.” Then Ar-Ridha’ (a.s.) added, “Therefore, he is the one who divides up Paradise and Hell as it is loving him which equals faith, and despising him which equals atheism.” Then Al-Ma’mun said, “O Abal Hassan (Ar-Ridha’)! May God not let me live after you! I testify that you are the inheritor of the knowledge of God’s Prophet (S).” Abi Salt (al-Harawi) added, “When Ar-Ridha’ (a.s.) returned home, I went to see him (a.s.) and said, “O son of God’s Prophet! How nice did you respond to the Commander of the Faithful’s (al-Ma’mun) question!” Ar-Ridha’ (a.s.) said, “O Aba Salt! I answered him using the same way that he was reasoning. I heard my father (a.s.) narrate on the authority of his forefathers (a.s.), on the authority of Ali (a.s.) that God’s Prophet (S) told him, “O Ali! You are the one to divide up Paradise and Fire on the Resurrection Day. You will order the Fire to let go of some saying that they are yours, and tell the Fire that some are for the Fire to capture and they belong to it.’”