Ghaibat Tusi: Ahmad bin Ali Razi has narrated from Muhammad bin Alifrom Ubaidullah bin Muhammad bin Jaban Dahqan from Abu Sulaiman Dawood bin Ghassan Bahrani that he said:
“Abu Sahl Ismail bin Ali Naubakhti told me that Imam M-H-M-D binImam Hasan Askari (a.s.) was born in Samarrah in 256 A.H. His mother wasSaiqal; his patronymic is Abul Qasim and the Messenger of Allah (s.a.w.s.)had mentioned the same patronymic and said: His name will be same as mine, his patronymic will be same as mine and his title will be Mahdi. He will the Divine Proof, the Awaited one and the Master of the Age. Ismail bin Ali further says: When Imam Hasan Askari (a.s.) was in his
fatal illness, I was present with him. He summoned his servant, Aqeed, whowas a Nubian black. Prior to this he was in the employ of Imam Ali Naqi(a.s.). It was he that had brought up Imam Hasan Askari (a.s.). Imam (a.s.)told him: “O Aqeed, boil for me some mastic water.” Aqeed obeyed and afterthe water was procured, Saiqal, the mother of Imam-e-Zamana(a.t.f.s.) brought it to His Eminence.
His Eminence took hold of the vessel but his hands shook so much thatthe bowl clattered against his teeth. The Imam let go of the vessel and said toAqeed: “Go inside the house where you will find a boy in prostration. Bringhim to me.”
Abu Sahl says: Aqeed said: When I went inside to bring that boy I sawthat the boy was in a prostration and he had raised his index finger to the sky.I saluted him. He shortened his Prayer. I said respectfully: “The master hascalled you.” At that moment his mother arrived and taking his hand broughthim to his father.
Abu Sahl says: When the boy came to His Eminence, he saluted him. Isaw that his face was glowing like a pearl, he had short hair and wide teeth.When the eyes of Imam Hasan Askari (a.s.) fell upon him, he wept and said:“O master of my family, give me this water so that I may proceed to myLord.” The young master complied and taking up the bowl of mastic waterbrought it to the lips of his father so that he may drink it. Then Imam HasanAskari (a.s.) said: “Prepare me for the ritual prayer.” That child kept a towelbefore the Imam and made ablution for him by washing his face and hands inturn. Then he did Masah of his head and both feet. The Imam said: “O myson, I give you glad tidings that you are the Master of the Time and the Proofof Allah on the face of the earth. You are my son and successor. You are born from me and you are M-H-M-D the son of Hasan son of Ali son of Muhammad son of Ali son of Musa son of Ja’far son of Muhammad son of Ali son of Husain son of Ali Ibne Abi Talib (a.s.) and you are from the progeny of the Holy Prophet (s.a.w.s.) and the last of the Purified Imams (a.s.). And the Messenger of Allah (s.a.w.s.) gave glad tidings about you and informed about your name and patronymic. This was told me by my father from his purified forefathers – blessings of Allah be on Ahle Bayt. Indeed our Lord alone is worthy of praise and glorification.”
Imam Hasan bin Ali Askari (a.s.) spoke these sentences and passed away at that very moment. May Allah bless them all.
Reference : Beharul anwar vol 51.52.53 , Part 1 , The Promised Mahdi