From Abdullah Ibn Sinan: I heard Imam Jaffar Sadik say: “Moses’ staff was the branch of one of the trees of Paradise, which Jibril gave to Moses (as) when he wished to go to the city of Madyan. THAT STAFF IS IN LAKE TIBERIAS TOGETHER WITH THE COFFIN OF THE PROPHET ADAM (AS). THEY NEITHER DECAY NOR ALTER. WHEN THE QAIM [HAZRAT MAHDI (AS)] EVENTUALLY APPEARS, HE WILL BRING THEM BOTH FORTH.” (Sheikh Muhammad ibn Ibrahim Numani, al-Ghaybah al-Numani, p. 278)
 

From Abul Jarud Ziyad Ibn Mundhir:

Imam Abu Jaffer Muhammad Ibn Ali said: “WHEN THE QAIM [HAZRAT MAHDI (AS)] COMES, HE WILL APPEAR WITH THE FLAG OF THE MESSENGER OF ALLAH (SAAS), THE RING OF SOLOMON (AS), AND THE STAFF AND STONE OF MOSES (AS)...” (Sheikh Muhammad ibn Ibrahim Numani, al-Ghaybah al-Numani, p. 279)

... HE [HAZRAT MAHDI (AS)]  WILL HAVE THE STAFF OF MOSES AND THE RING OF SOLOMON. ...Allah will keep him hidden from sight until He wills. Then he will appear and fill the Earth with justice, in the same way it was formerly filled with oppression. (Bihar Al-Anwar, Vol. 52, p. 32; Al-Hurr al-Amili, Ithbat al-Hudat, Vol. 6, p. 19)

 

The reason he is called Hazrat Mahdi (as) is that he shows the way to a hidden thing. HE WILL BRING FORTH THE ARK (ARK OF THE COVENANT) IN A PLACE KNOWN AS ANTIOCH. (As-Suyuti, Al-Hawi li al-Fatawa, II. 82)

 

HAZRAT MAHDI (AS) WILL BRING THE ARK OF THE COVENANT OUT OF THE CAVE OF ANTIOCH. (Ibn Hajar al-Haythami, Al-Qawl al-Mukhtasar fi `Alamat al-Mahdi al-Muntadhar, 54