NET
5 Then you must build an altar there to the Lord your God, an altar of stones—do not use an iron tool on them.
Darby
5 And there shalt thou build an altar to Jehovah thy God, an altar of stones; thou shalt not lift up an iron [tool] upon them;
KJV
5 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.