The prophecy is revealed gradually throughout the books:
* The Lightning Thief: The prophecy is first mentioned in the very beginning of the book, but not fully revealed until near the end of the book.
* The Sea of Monsters: More pieces of the prophecy are revealed, giving readers a clearer understanding.
* The Titan's Curse: The prophecy is finally fully revealed.
The Prophecy itself is:
* **"A child of the Big Three shall rise,
A hero of Olympus to stand against the tide.
A half-blood of the old gods,
Born of the lightning,
Shall face the rising darkness.
And the world shall know his name."**
You can find the full prophecy in various parts of the books, but it's not confined to a single page.