Deuteronomy 27:7 ASV

⁵  And there shalt thou build an altar unto Jehovah thy God, an altar of stones: thou shalt lift up no iron 'tool' upon them.

⁶  Thou shalt build the altar of Jehovah thy God of unhewn stones; and thou shalt offer burnt-offerings thereon unto Jehovah thy God:

⁷  and thou shalt sacrifice peace-offerings, and shalt eat there; and thou shalt rejoice before Jehovah thy God.

⁸  And thou shalt write upon the stones all the words of this law very plainly.

⁹  And Moses and the priests the Levites spake unto all Israel, saying, Keep silence, and hearken, O Israel: this day thou art become the people of Jehovah thy God.