Some ahadith about Imam Mahdi (ajtf) & Prophet Jesus (as):
1.The Commander of the Faithful (‘a) said in a sermon (khutbah): “…Then the Mahdi (‘atfs) will appoint Hadrat ‘Isa (‘a) as his representative in the offensive operations against ad-Dajjal (the Anti-Christ). ‘Isa (‘a) will set out to capture and suppress ad-Dajjal.
Ad-Dajjal who will then be controlling the entire world, destroying agriculture and human generation, will call the people toward him and anyone who accepts him will be treated with favor and anyone who refuses to accept him would be killed. He will travel throughout the world, with the exception of Mecca, Medina and Bayt al-Muqaddas (Jerusalem), and all the illegitimate children from both the east and the west of the globe will rally around him.
“Ad-Dajjal will set out toward the Hijaz and ‘Isa (‘a) will intercept him at the passage of Harsha. ‘Isa (‘a) will direct a horrible shout at him and strike him a decisive blow. Ad-Dajjal will melt in a blazing fire like lead melting in fire.”
Ash-Shi‘ah wa’r-Raj‘ah, vol. 1, p. 167
2.The Apostle of Allah said, “How can a community perish when I am at the beginning of it, Jesus the son of Mary will be at the end of it and al-Mahdi will be in the middle of it.”
Dala’il al-Imamah, 234
3.It is narrated from Ibne Abbas that the Messenger of Allah (a.s) said, “My Caliphs and successors are twelve persons, first of whom is my brother and the last my great grandson.” He was asked, “O Allah’s Messenger! Who is your brother?” He replied, “Ali bin Abi Talib.” He was asked, “Who is your great grandson?” He replied, “Mahdi, who shall fill the earth with justice and equity like it would be fraught with injustice and oppression. By the One in Whose hands is my life! Even if a day remains for the earth, the Almighty Allah will prolong this day till my son, Mahdi reappears and Isa bin Maryam descends to the earth and recites prayer behind His Eminence. The earth shall be illuminated from the east to the west.
Fara’id al-Simtayn. p. 43
4.In the book, Ghayah al-Maram, the Noble Prophet (S) is reported to have said: “During the advent of Hadrat al-Qa’im (‘atfs), Hadrat ‘Isa (‘a) will descend and collect the books from Antioch. God will lift the veil covering the face of “(And) Iram, (the city) of the pillars”15 for him and make manifest the palace that Hadrat Sulayman (Prophet Solomon) (‘a) built before his death.
He will gather together the properties of the palace and divide them among Muslims, and he will take out the ark which had been thrown into the Caspian Sea by the order of God to Aramya (Jeremiah).
“Whatever has been left for posterity by the family of Musa (Moses) and Harun (Aaron) (‘a) exists in that ark. Also in the same ark are the tablets (where the Ten Commandments were inscribed); the staff of Musa; the cloak of Harun; the ten types of foods that used to descend to the Children of Israel; and the roasted chickens preserved by the Children of Israel for their future generations. Then cities will be conquered with the help of the ark just as they have done before him.”
Ghayah al-Maram, p. 697; Hilyah al-Abrar, vol. 2, p. 620; Ash-Shi‘ah wa’r-Raj‘ah, vol. 1, p. 136. See Ibn Tawus, Malahim, p. 66; Ithbat al-Hudah, vol. 3, pp. 489, 541.
With only a slight variation, Yanabi‘ al-Mawaddah attributes the same thing to Hadrat al-Mahdi (‘atfs), stating: “Hadrat al-Mahdi (‘atfs) will take out books from a cave in the land of Antioch and he will take out the Zabur of Dawud (‘a) (Psalms of David) from the Caspian Sea. The relics of the family of Musa and Harun (‘a) exist in that book and the angels will carry it on their shoulders, and the tablets and staff of Musa are there as well.”
Yanabi‘ al-Mawaddah, p. 401. It is also recorded in Ibn Hammad, Fitan, p. 98; Muttaqi Hindi, Burhan, p. 157; Ibn Tawus, Malahim, p. 67.