Deuteronomy 27:4-6

New Catholic Bible

⁴ When you have crossed over the Jordan, I command you today, you are to set them up on Mount Ebal and plaster them over. ⁵ Build an altar there to the Lord, your God, an altar of stone. Do not use any iron tool upon them. ⁶ Build an altar of unhewn stones there to the Lord, your God. You shall offer your burnt offerings to the Lord, your God, there.