Salaam. Imam Ja'afar Sadiq said, "The face of Mehdi will appear on the Moon." With this, it is important to understand the difference between the words MEHDI and Mahdi, which are often confused with each other. Mehdi means "The One of the Moon" (Fitting, is it not?) and Mahdi means "the Learned One (The one able to render guidance)."
so he was Mehdi not Mahdi...shooo I got all scared..