This Is Mahdi; Follow Him!

In the Hadith of Mufaddal it is mentioned that:

“He (Imam Mahdi a.j) will come out with a cloud shading him from above and on which a caller would be announcing: This is Mahdi, the caliph of Allah; follow him.”

Excerpt from Mikyal al-Makarim, Vol 1 by Ayatullah Sayyid Muhammad Taqi Musawi Isfahani (ra)