Read Deuteronomy 27:5 Using Other Translations
And there shalt thou build an altar unto the LORD thy God, an altar of stones: thou shalt not lift up any iron tool upon them.
And there you shall build an altar to the LORD your God, an altar of stones. You shall wield no iron tool on them;
“Then build an altar there to the LORD your God, using natural, uncut stones. You must not shape the stones with an iron tool.