Joshua 6:25-26

25But Joshua kept Rahab safe, as well as her family and everyone who belonged to her. Rahab had hidden the men that Joshua sent to find out about Jericho city. Because she did that, her family still lives among the Israelites, even today.

26At that time, Joshua made a strong promise. He said, ‘If anyone tries to build Jericho city again, the Lord will punish him as a guilty man. When he starts to build, his oldest son will die. When he puts up the city's gates, his youngest son will die.’