Deuteronomy 27:5 in the King James Version
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.
Context
4 It shall be, when you have crossed over the Jordan, that you shall set up these stones, which I command you today, on Mount Ebal, and you shall coat them with plaster.
5 There you shall build an altar to the LORD your God, an altar of stones. You shall not use any iron tool on them.
6 You shall build the LORD your God’s altar of uncut stones. You shall offer burnt offerings on it to the LORD your God.