Deuteronomy 27:1-6 RSV

1 Now Moses and the elders of Israel commanded the people, saying, "Keep all the commandment which I command you this day.
2 And on the day you pass over the Jordan to the land which the LORD your God gives you, you shall set up large stones, and plaster them with plaster;
3 and you shall write upon them all the words of this law, when you pass over to enter 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.
4 And when you have passed over the Jordan, you shall set up these stones, concerning which I command you this day, on Mount Ebal, and you shall plaster them with plaster.
5 And there you shall build an altar to the LORD your God, an altar of stones; you shall lift up no iron tool upon them.
6 You shall build an altar to the LORD your God of unhewn stones; and you shall offer burnt offerings on it to the LORD your God;