Deuteronomy 27:6 Thou shalt build the altar of the LORD thy God of unhewn stones; and thou shalt offer burnt-offerings thereon unto the LORD thy God. (JPS ASV RSV)
Joshua 8:31 as Moses the servant of the LORD commanded the children of Israel, as it is written in the book of the law of Moses, an altar of unhewn stones, upon which no man had lifted up any iron; and they offered thereon burnt-offerings unto the LORD, and sacrificed peace-offerings. (JPS ASV RSV)