Deuteronomy 27:7

It shall be, when you have crossed over the Jordan, that you shall set up these stones, which I command you today, on Mount Ebal, and you shall coat them with plaster.

There you shall build an altar to the LORD your God, an altar of stones. You shall not use any iron tool on them.

You shall build the LORD your God’s altar of uncut stones. You shall offer burnt offerings on it to the LORD your God.

You shall write on the stones all the words of this law very plainly.”

Moses and the Levitical priests spoke to all Israel, saying, “Be silent and listen, Israel! Today you have become the people of the LORD your God.

You shall therefore obey the LORD your God’s voice, and do his commandments and his statutes, which I command you today.”