Joshua 6:25-26

25So Joshua spared Rahab the prostitute, with her father’s household and everything that she had; and she has lived among Israel to this day, because she hid the messengers (scouts) whom Joshua sent to spy out Jericho.

26Then Joshua made them take an oath at that time, saying, “Cursed before the Lord is the man who rises up and rebuilds this city, Jericho; with the loss of his firstborn he shall lay its foundation, and with the loss of his youngest son he shall set up its gates.”