Deuteronomy 27:1-7

The Altar on Mount Ebal 1Moses and the elders of Israel commanded the people: “Keep all these commands that I give you today. 2When you have crossed the Jordan into the land the LORD your God is giving you, set up some large stones and coat them with plaster. 3Write on them all the words of this law when you have crossed over to enter the land the LORD your God is giving you, a land flowing with milk and honey, just as the LORD, the God of your ancestors, promised you. 4And when you have crossed the Jordan, set up these stones on Mount Ebal, as I command you today, and coat them with plaster. 5Build there an altar to the LORD your God, an altar of stones. Do not use any iron tool on them. 6Build the altar of the LORD your God with fieldstones and offer burnt offerings on it to the LORD your God. 7Sacrifice fellowship offerings there, eating them and rejoicing in the presence of the LORD your God.