Harry potter question?

Yes, it was the prophecy. He knew it was in the Ministry, and only Harry could retrieve it which is why he showed him the image of him torturing Sirius because he knew it would get to him. So he needed Harry to retrieve it, and the plan was his Death Eaters get it from him. The Prophecy only said "Neither can live while the other survives", so Voldemort's plan kind of backfired in more ways than one.