What prophets (p.b.u.Th) didn’t finish yet… [Because of lots of obstacles]                 Â
God has willed to keep him [Imam Mahdi (p.b.u.h)] alive. Because (from the first to the last prophets (p.b.u.Th)), no one except him could have taken it; to expand justice all around the world. This is what prophets (p.b.u.Th) didn’t finish, although they had been sent for it.