Isaiah 19:19-20

19At that time, there will be an altar in the middle of Egypt's land, where people will worship the Lord. There will also be a tall stone for the Lord at Egypt's border.

20Those two things will be signs to tell everyone in Egypt about the Lord Almighty. Because of those signs, the Egyptians will remember that the Lord is powerful. When their enemies are cruel to them, they will call out to the Lord for help. Then he will send a strong saviour to rescue them.