Imam al-Mahdi (may Allah hasten his holy reappearance) is the 12th Imam of Ahl al-Bayt (peace be upon them) and the ninth son of Imam al-Hussayn (peace be upon him). He was born in the mid of Sha'ban 255 AH in Samarra, many narrations and conversations described him being the One by whom the earth will be filled with justice and equity thoroughly the same as it has been filled with injustice and oppression.
The Master of Time and Order is from the progeny of Imam al-Hussayn (peace be upon him) son of Imam Ali ibn Abi Taleb and Lady Fatima az-Zahra (peace be upon both of them). The Prophet (Allah's prayers be upon him and upon his holy Household) said: "And from us, the Mahdi of the nation, behind whom Jesus prays, Then he struck Hussayn’s shoulder with his hand and declared: “The Mahdi of my community will be from the descendants of this son of mine." The Holy Prophet (Allah's prayers be upon him and upon his holy Household) said: "Imam al-Mahdi is from my descendants from Fatima’s lineage." Then we know from all this that Imam Mahdi is one of the imams of Ahl al-Bayt (peace be upon them). He is the last of the twelve imams who were preached by the Messenger of Allah (Allah's prayers be upon him and upon his holy Household): "There will be Twelve Commanders. All of them will be from Quraysh." from the descendants of Lady Fatima az-Zahra and descendants of Imam al-Hussayn (peace be upon them).
It is narrated from Mohammad bin Abdullah Tahawi that he said:
“I went to see Lady Hakima the daughter of Mohammad (peace be upon him) after the demise of Abu Mohammad (peace be upon him) to ask her about the Hujjah and the confusion in which people had split many ways.
She said to me: Sit down. I sat down and she said: O Mohammad, verily Allah, the Mighty and Sublime does not leave the earth without a Hujjah, be he a speaking one or a silent one. He has not put it in two brothers after Al-Hassan and Al-Hussayn, as a token of distinction for Al-Hassan and Al-Hussayn and to mark their superiority lest there will be their peer on earth.
However, Allah, the Mighty and Sublime gave excellence to the progeny of Al-Hussayn over the progeny of Al-Hassan as He gave excellence to the progeny of Harun over the progeny of Musa, though Musa was Hujjah over Harun. And this excellence is for the progeny until the Judgment Day.
There must be a trial for the Ummah, said she: In which falsifiers will fall in doubts and in which verifiers will find salvation, lest people will have an argument against Allah after the messengers. This trial has occurred after the demise of Abu Mohammad al-Hassan (peace be upon him). I asked her: O my lady, did Al-Hassan (peace be upon him) have a son? She smiled and then said: If Al-Hassan (peace be upon him) did not have a son, then who is the Hujjah after him, considering I told you that Imamate will not be in two brothers after Al-Hassan and Al-Hussayn (peace be upon him).
So I said: O my lady, tell me about the birth of my master and his occultation. She said: Yes, there was a bondmaid of mine called Narjis. My nephew came to visit me. He came forward intensely looking at her. I said: My Master, perhaps you have a desire for her. So, I will send her to you. He said: No, Aunt, rather I wonder at her. I asked: What makes you wonder? He said: She will give birth to a boy, who is much dignified before Allah, the Mighty and Sublime, who will fill the earth through him with equity and justice as it will be full of corruption and oppression. I said: So, I will send her to you, O my Master. He said: Seek my father’s permission in that regard.
I put on my clothes and came to the house of Abu Al-Hassan (peace be upon him). I greeted him and sat down. He initiated the conversation and said: Hakima, send Narjis to my son, Abu Mohammad. I said: My master, I came for this purpose to you to seek your permission. He said: O blessed lady, Allah, the Mighty and Sublime desired to give you a share in the reward and put a stake for you in the good. Lady Hakima said: I did not stand. I returned to my house and adorned her and gave her to Abu Mohammad (peace be upon him). I facilitated the union between them at my house and he stayed with me a few days and then went to his father. I sent her with him.
Lady Hakima said: Abu al-Hassan (peace be upon him) passed away and Abu Mohammad (peace be upon him) took his father’s seat. I would visit him like I visited his father. One day Narjis came to me to take off my shoes and said: My mistress, allow me to take off your shoes. I said: Rather you are my mistress and the mistress of my household. By Allah, I will not forward my shoes to you so you take them off. Nor will you serve me. Rather, I will serve you with pleasure. Abu Mohammad (peace be upon him) heard that and said: May Allah reward you Aunt.
I stayed at his house until sunset. Then I called my bondmaid and said: Bring me my garments so I may leave. He said: Aunt, stay with us tonight, for tonight the infant who is dignified before Allah, the Mighty and Sublime, will be born, through whom Allah, the Mighty and Sublime will revive the earth after its death. Not seeing any sign of pregnancy in Narjis, I asked: From whom, my Master? He replied: From Narjis, not from anyone else.
Lady Hakima says: I went to Narjis and turned her on her abdomen, but I did not see any sign of pregnancy. I returned to him and told him of my observation. He smiled and said: Her example is the similitude of the mother of Musa (peace be upon him). Pregnancy did not appear in her and none knew of it until the time of delivery. Because Pharaoh was cutting the abdomens of pregnant women in search of Musa. This is like Musa (peace be upon him).
Lady Hakima says: I was constantly watching her until the time of dawn. She was sleeping before me and was not moving from one side to the other. When it was the time of the end of the night and near the dawn, she got up sacredly. I pulled her to my breast and took the Divine name on her. Abu Mohammad (peace be upon him) called out: Recite Surah Qadr on her. I began reciting that and asked her: How do you feel? She said: The affair of which my Master has informed you has approached. I began reciting the verses, as had ordered me my master. At this, the baby answered back to me from her abdomen; he was reciting like I was reciting and he greeted me.
Lady Hakima said: I felt shocked when I heard that. So Abu Mohammad (peace be upon him) called out to me: Do not wonder from the Command of Allah, the Mighty and Sublime; He gives us speech at infancy and makes us Hujjah on earth at maturity. These words had not yet finished that Narjis disappeared from me. I did not see her, as if a veil had been erected between me and her. I ran to Abu Mohammad (peace be upon him) crying.
He said to me: Return, O Aunt, you will find her in her place. She said: I returned and it was but a moment that the veil was removed from between me and her. I saw her as glows of light on her strained my eyes. I was seeing the baby that was prostrating on his face, hobbling on his knees, raising his forefingers towards the heavens and saying: I bear witness that a deity other than Allah, the One without a partner, is not; and that my grandfather is the Messenger of Allah; and that my forefather is the Commander of the Faithful.
He then counted each and every Imam until he reached himself and said: O Allah, fulfill me my promise, complete my enterprise for me, strengthen my position and fill the earth through me with equity and justice. Abu Mohammad (peace be upon him) called out: Aunt, get him to me. I got the blessed baby and brought him to his father. When I appeared with him in my arms before his father he greeted his father. Al-Hassan took him as birds were striking wings over his head.
He called to one of the birds and said: Carry him and protect him and return him to us every forty days. The bird took him and flew away with him to the heavens, with the rest of the birds following. I heard Abu Mohammad (peace be upon him) say: I entrust you to the One that mother of Musa entrusted. Seeing this, Narjis wept. So he said to her: Relax, he will not suckle but from your breasts. He will be returned to you as Musa was returned to his mother. It is His word: Then we returned him to his mother so her heart may find solace and lest she grieves.
Lady Hakima said: I asked: What is this bird? He replied: It is the Holy Spirit (Ruhul Qudus), who is assigned to the Imams to make them successful and firm and to facilitate their growth through knowledge. When it was forty days, the boy was returned. My nephew sent for me and called me over. I went to him and saw a child moving about in front of him. I said: My master, this is a boy of two years. He smiled and said: The sons of apostles and successors, when they are Imams, they grow differently from others. A child of ours talks in the womb of his mother, recites the Quran and worships his Lord. At the age of suckling, angels obey him and descend to him every morning and evening.
Lady Hakima said: I always saw that child every forty days until I saw him a grown up man a very few days prior to the demise of Abu Mohammad (peace be upon him). I did not recognize him. I said to Abu Mohammad (peace be upon him): Who is this man that you ask me to sit in front of him? He said: The son of Narjis. And he is my successor after me. Soon you will not find me amongst you.
So listen to him and obey him. Abu Mohammad (peace be upon him) passed away after a few days and people split different ways as you see. By Allah, I see him every day and night and he informs me of what you people ask about so I may answer you. By Allah, when I want to ask him about something, he answers me before I ask him. If something comes up, his answer comes to me immediately without my asking. He told me just yesterday about your coming to me and ordered me to inform you of the truth.”
Mohammad bin Abdullah says: By Allah, Lady Hakima told me of things that no one knew except Allah, the Mighty and Sublime. So I realized that this is the truth and rightfulness from Allah, the Mighty and Sublime and that Allah, the Mighty and the High has informed him of which He has not informed anyone in His creation.