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:

۱۲ caliphs after the Prophet (pbuh&h); they are as many as the chiefs of Israelites.[2]

۲-    Rightfulness of a man from Quraysh; named “Mahdi (mgehr)”

۳-    Mahdi (mgehr); Fāṭimah (pbuh)’s descendant. [He is the last Imam].

۴-    His name as same as the Prophet (pbuh)’s name

۵-    Muḥammad ibn Ḥasan ‘Askarī (pbuh)

۶-    The earth never exists without the Proof of God [Imam Mahdī (mgehr)]’s presence

۷-    Glad tidings that Imam Mahdi (mgehr) emerges in The Last Era

۸-    Helpers who introduce the emergence

۹-    Anybody who dies ignorant about him [Imam Mahdi (mgehr)], their death is an ignorance one!

۱۰-Imam Mahdi (mgehr)’s enemies

۱۱-Return of Jesus (pbuh); Mary (pbuh)’s son

۱۲- Saying prayer by Jesus (pbuh), behind Imam Mahdi (mgehr)

Bavari, “Expecting [looking forward to the Emergence] Phoenix”, P.59-200

[۱]  May God expedite his reappearance
[۲] 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.