Deuteronomy 27:2-4

2 When you have crossed the Jordan into the land the LORD your God is giving you, set up some large stones and coat them with plaster.
3 Write on them all the words of this law when you have crossed over to enter the land the LORD your God is giving you, a land flowing with milk and honey, just as the LORD, the God of your ancestors, promised you.
4 And when you have crossed the Jordan, set up these stones on Mount Ebal, as I command you today, and coat them with plaster.