The oldest known stone tablet featuring the Ten Commandments is set for auction at Sotheby’s and may sell for as much as $2 million.

The oldest known tablet inscribed with the Ten Commandments from the Old Testament is expected to fetch up to $2 million when it goes up for auction next month.

For thirty years, the plaque served as a paving stone at the entrance of a house, with the inscription facing up and exposed to foot traffic.