Deuteronomy 27:2-4

2Now on the day when you cross over the Jordan to the land that Adonai your God is giving you, you are to set up large stones for yourself and coat them with plaster.

3Then you are to write on them all the words of this Torah when you cross over—so that you may enter the land that Adonai your God is giving you, a land flowing with milk and honey just as Adonai, the God of your fathers, promised you.

4Now when you cross over the Jordan, you are to set up these stones about which I am commanding you today on Mount Ebal, and coat them with plaster.