Joshua 2:17-21

But the men warned her, “You must do what we say, or we will not be bound to the oath you made us swear. When our invasion begins, bring all your family together in your house—your father and mother, your brothers and sisters, and all their families. And tie this crimson rope in the same window through which you let us down. Remember, if anyone ventures outside your house, his death will be his own fault, not ours! But if anyone inside your house is harmed, then we will be held responsible. And if you disclose our mission, we will be released from the oath you made us swear.” Rahab replied in agreement, “Let it be as you say.” And she sent them away, and after they departed, she tied the crimson rope in her window.