as follows:
"One day, I went to Imam Hassan al-Askari (a.s.). He (a.s.) requested me, ‘Aunt, Stay with us tonight because my successor will appear.' I asked, ‘From whom?' He (a.s.) answered, ‘Narjis'. I reasoned, ‘But I don't see any signs of pregnancy in her!' He retorted, ‘Her likeness is of the mother of Hazrat Moosa (a.s.) who did not have any signs of motherhood till the actual hour of delivery.'
I and Narjis slept in one room. At midnight, I became busy in performing the midnight prayers. I said to myself, ‘Dawn is near but whatever Imam Askari (a.s.) had said has not yet come to pass.' Suddenly from the next room, Imam Askari (a.s.) called out, ‘Aunt! Don't be in haste.' Being ashamed (of my thought), I returned to my room. Narjis came forward to receive me, restless and shivering. I held her close to my chest and recited Surah Tauheed, Surah Qadr and Ayat al-Kursi for her. As I was reciting the above verses, the child in the womb was reading along with me. At that very moment, the room shone with light. The sight of Allah's newborn representative in prostration towards the Holy Kaba delighted me. I picked him up in my arms. Imam Hassan al-Askari (a.s.) called out, ‘Bring my son to me.'
I took the infant to his father. He put his tongue in his mouth and laying him in his lap, he ordered, ‘Son, talk, by the permission of Allah.' At once, the infant began reciting,
‘I seek refuge in Allah, the All-Hearing, the All-Seeing from the accursed Shaitan. In the Name of Allah, the Beneficent, the Merciful. And We intend to oblige those who have been rendered weak in the land and that We will make them the Imams and We will make them the heirs. And We will establish them in the earth and We showed Firaon and Haamaan and their armies from them what they were warned. And blessings of Allah be upon Muhammad al-Mustafa, Ali al-Murtaza, Fatema al-Zahra, al-Hassan, al-Hussain, Ali Ibn Husain, Muhammad Ibn Ali, Jafar Ibn Muhammad, Moosa Ibn Jafar, Ali Ibn Moosa, Muhammad Ibn Ali, Ali Ibn Muhammad and, my father Hasan Ibn Ali.
Hakeemah says, ‘We were surrounded by green birds'. Imam Hassan al-Askari (a.s.) looked at one of them and cried, ‘Take care of him (the new infant) till Allah grants him permission. Allah will take His affair to completion.' I enquired, ‘Who is this bird and who are the other birds that are accompanying him?' He (a.s.) replied, ‘He is Jibraeel and the others are the angels of divine mercy.' Thereafter, he (a.s.) said, ‘Aunt! Kindly return the child to his mother so that she becomes happy and joyous. Know that Allah's Promise is true but most of the people know not.'
imam mahdi
I returned the child to his mother. He was very clean, pure and unblemished. On his right shoulder, it was inscribed.
s.) For details, one can refer to the 51st volume of Behaar al-Anwaar and other related books on the subject.
source : www.tebyan.net