Joshua 6:25-26

25So Joshua spared Rahab the prostitute and her relatives who were with her in the house, because she had hidden the spies Joshua sent to Jericho. And she lives among the Israelites to this day.

26At that time Joshua invoked this curse: “May the curse of the Lord fall on anyone who tries to rebuild the town of Jericho. At the cost of his firstborn son, he will lay its foundation. At the cost of his youngest son, he will set up its gates.”