Deuteronomy 27:4-6

New Revised Standard Version Catholic Edition

⁴ So when you have crossed over the Jordan, you shall set up these stones, about which I am commanding you today, on Mount Ebal, and you shall cover them with plaster. ⁵ And you shall build an altar there to the Lord your God, an altar of stones on which you have not used an iron tool. ⁶ You must build the altar of the Lord your God of unhewn^[a] stones. Then offer up burnt offerings on it to the Lord your God,