In ‘Nur-ul-Absar’ Page 229 a tradition has been narrated from Ali (A.S.) who narrates from the Holy Prophet (S.A.WA.) as such:
“If there remains not more than a day from the life of the earth, surely God will make a person from my progeny to appear” (on that day).
Then the author continues: “This hadith has also been narrated by Abu Dawoud in his ‘Sunan’.
In the same book on Page 231, it is narrated from Abu Huraira who narrates from the Holy Prophet (S.A.W.A.) that:
“Qiyamat shall not be established until a person from my progeny comes and rules.
On Page 151 of Es’aaf-ur-Raghebben it is mentioned that Ahmad and Mawardi have narrated from the Holy Prophet (S.A.W.A.) who said: “Glad-tidings to you (all) about Mahdi.” The same has come in ‘Nur-ul Absar’ Pg. 151.
Author of ‘Nur-ul-Absar’ writes on Page 230 as such: Ahmad narrates from Abu Sa’eed Khudri that the Holy Prophet (S.A.W.A.) has said: “I give you glad-tidings about Mahdi.”
In “Yanabi-ul-Mawadda” (Page 432) it is narrated from Qetaada who said: “‘I asked Sa’eed-ibn-Maseeb: “Is there any truth in Mahdi?” He replied, ‘Yes, he is the truth and he is from the progeny of Fatemah.’”13
In the same book, on the afore-said page it is narrated from Ali (A.S.) who has narrated from the Holy Prophet (S.A.W.A.) that: “If there remains not more than a day from the life of the earth, indeed God shall make a person from my progeny to appear.”
Thereafter he writes: “This hadith has also been narrated by Abu Dawoud, Ahmad, Tirmidhi and Ibn-Maaja.”
Also, in the same book on Page 432, a tradition is narrated from ‘Musnad’ of Ahmad who has narrated from the Holy Prophet (S.A.W.A.) as such: -
“Qiyamat shall not be established until the earth is filled with cruelty and oppression. Then a person from my progeny shall appear and fill it with equity and Justice.”
Again, in the afore-mentioned book on Page 440 he writes: Mufeq-ibn Ahmad Akhtab narrates a sermon of Khawarazm who takes reference from Abdur-Rahman-ibn-Abi Laili who narrates from his father who said: - “In the battle of Khaibar, the Holy Prophet (S.A.W.A.) handed over the banner to Ali (A.S.). Then Allah ordained victory by his hands.
Later, at Ghadir-e-Khum he reminded the people that Ali was the ‘Maula’ (Master) of all believing men and women and continued until he expressed few sentences about the virtues of Ali, Fatemah, Hassan and Hussein.” Thereafter he said: “Gabriel has informed me that after my departure they shall be subject to injustice and oppression and this oppression shall continue until a movement is brought about by their “Qa’em” and at that time their creed will be raised high, people shall turn towards their friendship, ill-speaking towards them shall diminish, those having unpleasantness for them shall be degraded and those eulogizing them shall increase. Such kind of events will occur when cities shall collide with each other and people become weak and helpless of respite. At that time shall appear the (Qa’em) (Mahdi) from my progeny and God will manifest the truth through him and extinguish the falsehood by his sword.” Thereafter he said: ‘O people, glad-tidings to you of relief and respite. Surely the promise of Allah is true and He never breaks it and His decree never gets refuted. He is All - Aware and All-seeing and the victory of Allah is near.
In the same book on Page 447 he narrates from the book of “Fara’ed us-Semtain” from Shaikh Abu Ishaaq Ibrahim-ibn-Yaqub who narrates from Jabir-ibn-Abdulla Ansari that the Holy Prophet (S.AW.A) has said: -
“The one who denies the emergence of Mahdi has surely disbelied to whatever God has revealed upon Muhammad and the one who denies the coming of Isa (Jesus) has surely become a disbeliever and the one who denies the revolt of Dajjal has surely become a disbeliever.”1
Source: AL-MAHDI (A.S.): By Sayyed Sadruddin Sadr, Translated by: Jalil Dorrani [p 12-13].