* The first book ever created? This is a very complex question with no definitive answer. There is evidence of writing systems dating back thousands of years, but the first true "book" as we know it is difficult to pinpoint.
* A specific book, like the Bible or the Quran? These religious texts have long and complex histories of being compiled and revised over centuries. Their creation dates are not singular events.
* The concept of "book"? The concept of a book as a collection of written material has existed for centuries, but its exact origin is unclear.
Please clarify your question to get a more precise answer.