The statistics of Mahdavi ʼAḥādīth, in some authentic books to Sunnis
1- “Sunan” of Abu Dāwood has 5274 ʼAḥādīth [Hadiths].
And twelve of them in the volume four, part “Kitāb al-Mahdi” are about Imam Mahdi (hgr).
2-“Sunan” of Tirmidhi: In Abwāb al-Ghadr, there is a chapter named “Mā Jā’a fi al-Mahdi”.
In this chapter four ʼAḥādīth are explicitly [mentioned] about Imam Mahdi (hgr).