The Question and Answer section for Oedipus Rex or Oedipus the King is a great resource to ask questions, find answers, and discuss the novel.
The play opens in front of Oedipus' palace at Thebes. A plague besets the city, and Oedipus enters to find a priest and crowd of children praying to the gods to free them from the curse.
That was basically the prophecy that comes true.
Teiresias seems to have a direct line to Apollo: he receives visions of the future. He believes that telling the future is of no consequence because fate is preordained.