I. Koran
Holy Koran is the pure treasury of Divine Knowledge and the durable source of all sciences which humans may need . It is the right book of the truest news which explains the past and foretells the future . nothing is eliminated in it and everything is explained or should be explored by interpreters . However , huge amount of facts are hidden deep inside its verses and just those who can explore their depth , are allowed to learn the real meanings . They are the real interpreters of Koran , the holy prophet (p.b.u.h.) and his successor.
Imam Mahdi (p.b.u.h.) and his revolution is one of the most important facts in the universe which is pointed out for many times in Koran and many Hadiths interpret out for many times in Koran and many Hadiths interpret those verses , referring to Imam Mahdi (p.b.u.h.) here one some :
“Before this in the Psalms , We wrote as in the previous writ: My righteous servants shall , the earth inherit. “ (Koran, 21 / 105 )
Imam Baqer (p.b.u.h.) interprets this verse as :
“By righteous servants who shall inherit the earth , God means Imam Mahdi (p.b.u.h.) and his followers.”
Another verse indicating this subject is:
“ And we intended to be gracious to the folk , oppressed and weakened in the land and make them leaders of the faith and give them honors to be the heirs . “ ( I bid , 28/5 )

Imam Ali (p.b.u.h.) explained about this verse as this:
“The folk, oppressed and weakened” are the holy prophet (p.b.u.h.)’s successor . After a long time of oppression and effort , the “ Mahdi” this family shall rise up, due to Allah’s order and takes them to the high points of honor and dignity and destroys all their foes.
Another verse, (11/86) indicates:
“The gift of God , the residue , is best for you , if you are faithful …”
And Imam Baqer (p.b.u.h) explained:
“When he [Imam Mahdi (p.b.u.h)] reappears, he leans back to ka’aba and the first thing he says is the above verse, then he continues: “I am the gift of God and his residue, and his successor and proof on the earth.” Hence everyone who wants to salute him shall say: “Praise be to you, the gift of God and his residue on earth.
In sura 57, verse 17, we see:
“Know that it’s Allah who revives the earth after it dies; already have we made the portents plain , perchance you realize . “
Imam Sadeq (p.b.u.h) elaborates this verse as:
“It means Allah revives the earth with the justice Imam Mahdi (p.b.u.h) brings to the whole world, when it is filled with cruelty.”

II. Hadiths
There are many Hadiths about Imam Mahdi (p.b.u.h.) which include all periods of his life , as his birth , childhood , Short Occultation and Long Occultation , signs of his reappearance and his rule over the world . the holy prophet (p.b.u.h) and all his preceding Imams have talked about him and even explained his appearance , character is tics his time of Occultation and even explained his appearance , character is tics , his time of Occultation and reward to those who wait for him . the significant point to be mentioned is that many of these Hadiths are widely transmitted by both Shiites and Sunnis . Since all the infallibles [the holy prophet and his successors (p.b.u.t)] have talked about Imam Mahdi (p.b.u.h), and now let’s review some:

- The holy prophet (p.b.u.h) :
“How lucky are those who see Mahdi (p.b.u.h) and those who love him and those who believe in his Imamate.”
- Imam Ali (p.b.u.h.) :
“Wait for the Deliverance [of Imam Mahdi (p.b.u.h)] and do not get disappointed of God’s grace. Surely the best thing for God is waiting for his deliverance “
- It is written in Zahra (p.b.u.h.)’s book that:
“Then, to complete my grace on the universes, I finish the chain of Imams with Imam Hassan Askari (p.b.u.h)’s son, who has Moses’ perfection, Jesus’ glory and Job’s patience…”
- Imam Hassan Mojtaba (p.b.u.h) explains the difficulties after the holy prophet (p.b.u.h) and says :
“ At the end of days , God shall rise up a man . He sends His angels to support him and his followers … And he shall rule over the entire world … He fills the world with justice, light and plain proof… How lucky are those who live then and obey him.”
- Imam Hussein (p.b.u.h) says :
“God revives the earth by him [Imam Mahdi (p.b.u.h.)] after it dies and he conquers all religions with the right, even if the polytheists are reluctant. At the time of his Occultation some people refuse to follow the right path and some sustain … Be sure those who are stead fast in the right path and bear the difficulties and denials are alike warriors who fought to help the holy prophet (p.b.u.h.) .
- Imam Sajad (p.b.u.h.) said :
“Those who are stead fast in their loyalty to us during the Occultation , shall be rewarded as one thousand martyrs of Badr and Ohod . “
- Imam Baqer (p.b.u.h.) said :
“A time shall come when [your] Imam will be hidden; so how lucky are those who stay steadfast in their loyalty to us.”
- Imam Sadeq (p.b.u.h) said:
“Our Upholder shall be hidden twice; first for a short time (Short Occultation) and then for a long time (Long Occultation).”
- Imam Kazem (p.b.u.h) said :
“ Imam Mahdi (p.b.u.h.) shall disappear but the faithfuls shall not forget him “
- Imam Reza (p.b.u.h) said:
“When Imam Mahdi (p.b.u.h.) rises up, he shall lighten the world and bring the justice to people. Then no one can treat others cruelly.”
- Imam javad (p.b.u.h) said :
“Our Upholder is the one for whom people shall wait during his Occultation and obey him when he reappears.
- Imam Hadi(p.b.u.h) said :
“ my following Imam is Hassan and after him Upholder , his son , is the next Imam . He is the one who fills the world with justices when it is full of cruelty “
- Imam Hassan Askari (p.b.u.h) said :
“Praise be to Allah, who let me know successor before I die. He is the most similar person to the holy prophet (p.b.u.h.) both in appearance and characteristics.”