Deuteronomy 27:4-7

4So it shall be when you cross the Jordan, you shall set up these stones 1on Mount Ebal, 2as I am commanding you today, and you shall coat them with lime.

5Moreover, you shall build there an altar to the Lord your God, an altar of stones; you 3shall not wield an iron tool on them.

6You shall build the altar of the Lord your God of 4uncut stones, and you shall offer on it burnt offerings to the Lord your God;

7and you shall sacrifice peace offerings and eat there, and 5rejoice before the Lord your God.