Muhammad b. `Ali Majiluwayh narrated to us. He said: `Ali b. Ibrahim b. Hashim narrated to us. He said: I heard a man from our companions say: When Harun al-Rashid imprisoned Musa b. Ja`far عليه السلام, night befell him. He feared that Harun may kill him. So, Musa عليه السلام renewed this purification, faced the qibla, prayed four voluntary units for Allah, then supplicated with this supplication: O my Master! Save me from the prison of Harun, and deliver me from his hands, O deliverer of the tree from the sand, clay, and water; O deliverer of milk from excretion and blood; O deliverer of the child from the placenta and the womb; O deliverer of fire from iron and stone; O deliverer of spirit from the intestines, deliver me from the hands of Harun. He said: When Musa عليه السلام supplicated with this supplication, Harun saw a black man in his dream. In his hand was a sword as he stood over the head of Harun, as he was saying: “O Harun! Let Musa b. Ja`far go. If you don’t, then I will strike your neck with this sword.” So, Harun feared his awesome aura, and he called for his gatekeeper. When the gatekeeper came, he said to him: Go to the prison and free Musa b. Ja`far. So, the gatekeeper went to the gate of the prison and knocked on it. The warden answered him and said: Who is this? He said: Surely, the caliph is calling for Musa b. Ja`far, so free him from your prison. So, the warden yelled: O Musa! The caliph calls for you. So, Musa عليه السلام stood suddenly, surprised and saying: He does not call for me tonight except to do an evil thing to me. So, he stood weeping, grieving, worried, and sorrowful about his life. He was taken to Harun shaking, so he said: Peace be to Harun (salam `ala harun). So, he responded, then Harun said to him: I adjure you by Allah, did you make any supplication in the middle of this night? So, he said: Yes. He said: What was it? He said: I renewed my purification, and I prayed four voluntary prayers for Allah, and I raised my sight to the sky, and I said: “O my Master! Deliver me from the hands of Harun and his evil”, and he mentioned what was left of his supplication. So, Harun said: Allah has answered your supplication. O gatekeeper, free him. Then, he called for a robe, and he put three robes onto him, and mounted him on his horse, and honoured him, and regretfully sent him off. Then, he said: Give me the words [to the supplication] so that I may memorize it. Then, he called for a tablet and wrote the words. He said: So, he sent him away, and he surrendered him to his gatekeeper so that he could send him to the house. So, Musa b. Ja`far عليه السلام became honoured by Harun, and he would visit him every Thursday.