Deuteronomy 27:2-4

2And it shall be, on the day when you cross over the Jordan to the land which the Lord your God is giving you, that you shall set up for yourselves large stones, and whitewash them with lime.

3You shall write on them all the words of this law, when you have crossed over, that you may enter the land which the Lord your God is giving you, ‘a land flowing with milk and honey,’ just as the Lord God of your fathers promised you.

4Therefore it shall be, when you have crossed over the Jordan, that on Mount Ebal you shall set up these stones, which I command you today, and you shall whitewash them with lime.