Deuteronomy 27:1

It shall be on the day when you shall pass over the Jordan to the land which the LORD your God gives you, that you shall set yourself up great stones, and coat them with plaster.

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

It shall be, when you have crossed over the Jordan, that you shall set up these stones, which I command you today, on Mount Ebal, and you shall coat them with plaster.