Perhaps a lot of Shias and Sunnis do not know, how many various issues in Sunni sources have been about Imam Mahdi (mgehr) and his emergence. [Here are] some examples:
12 caliphs after the Prophet (pbuh&h); they are as many as the chiefs of Israelites.[2]
2- Rightfulness of a man from Quraysh; named “Mahdi (mgehr)”
3- Mahdi (mgehr); Fāṭimah (pbuh)’s descendant. [He is the last Imam].
4- His name as same as the Prophet (pbuh)’s name
5- Muḥammad ibn Ḥasan ‘Askarī (pbuh)
6- The earth never exists without the Proof of God [Imam Mahdī (mgehr)]’s presence
7- Glad tidings that Imam Mahdi (mgehr) emerges in The Last Era
8- Helpers who introduce the emergence
9- Anybody who dies ignorant about him [Imam Mahdi (mgehr)], their death is an ignorance one!
10-Imam Mahdi (mgehr)’s enemies
11-Return of Jesus (pbuh); Mary (pbuh)’s son
12- Saying prayer by Jesus (pbuh), behind Imam Mahdi (mgehr)
Bavari, “Expecting [looking forward to the Emergence] Phoenix”, P.59-200
[1] May God expedite his reappearance
[2] They are of the Hebrew nation or people. According to tradition, they are descended from prophet Jacob (pbuh); also named “Israel”. His twelve sons became founders of the twelve tribes of ancient Israel.