Deuteronomy 27:2-8

2And it shall be on the day when ye pass over the Jordan unto the land which Jehovah thy 1God giveth thee, that thou shalt set thee up great stones, and plaster them with plaster:

3and thou shalt write upon them all the words of this law, when thou goest over that thou mayest enter into the land which Jehovah thy 2God giveth thee, a land flowing with milk and honey, as Jehovah the 3God of thy fathers hath promised thee.

4And it shall be when ye go over the Jordan, that ye shall set up these stones, as I command you this day, on mount Ebal, and thou shalt plaster them with plaster.

5And there shalt thou build an altar to Jehovah thy 4God, an altar of stones; thou shalt not lift up an iron [tool] upon them;

6of whole stones shalt thou build the altar of Jehovah thy 5God; and thou shalt offer up burnt-offerings thereon to Jehovah thy 6God.

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

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