This would make the 1,000-year-old bible the most expensive book ever sold at an auction.

This coming spring, a more than 1,000-year-old Hebrew Bible could fetch up to $50 million at an auction, making it the most priceless historical item ever offered for sale.

The ninth-century treasure known as the Codex Sassoon will be put up for auction by Sotheby’s in May.

Watch and learn about the bible’s history and why it’s expected to be sold for such an incredibly high price.