Deuteronomy 27:5
5 And there you shall build an altar to the Lord your God, an altar of stones. wYou shall wield no iron tool on them;
Joshua 8:31
31 just as Moses the servant of the Lord had commanded the people of Israel, as it is written in the Book of the Law of Moses, “an altar of uncut stones, upon which no man has wielded an iron tool.” And they offered on it burnt offerings to the Lord and sacrificed peace offerings.
