Answer:
Wedding his mother.
Step-by-step explanation:
The play "Oedipus the King" by Sophocles revolves around the story of Oedipus and his rise to becoming the king of Corinth. At the same time, it also delves into the conflict in him, with the prophecy that he will kill his father and sleep with his mother.
When the messenger came from Corinth to deliver the news of King Polybus's death to Oedipus, the news was met with happiness and elation. This was because the prophecy that he will bring about the death of his father has been proven to be false, for, at the time of Polybus's death, he (Oedipus) was far away from Corinth. This shows how life is all about chances and not about prophecies. But he still feared the feeling that prophesied that he will sleep/ marry his mother.