Deuteronomy 27:4-6 ▼

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

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

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