Deuteronomy 27:4-7

4So it shall be when you cross the Jordan, you shall set up 1on Mount Ebal, these stones, 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 4wield an iron tool on them.

6You shall build the altar of the Lord your God of 5uncut stones, and you shall offer on it burnt offerings to the Lord your God;

7and you shall sacrifice peace offerings and eat there, and 6rejoice before the Lord your God.