Deuteronomy 27:1-4

1 And Moses with the elders of Israel commanded the people, saying, Keep all the commandments which I command you this day.

2 And it shall be on the day when you shall pass over Jordan to the land which the LORD your God gives you, that you shall set you up great stones, and plaster them with plaster:

3 And you shall write on them all the words of this law, when you are passed over, that you may go in to the land which the LORD your God gives you, a land that flows with milk and honey; as the LORD God of your fathers has promised you.

4 Therefore it shall be when you be gone over Jordan, that you shall set up these stones, which I command you this day, in mount Ebal, and you shall plaster them with plaster.