Joshua 2:17-18

17And the men said to her, We will be blameless of this thy oath which thou hast made us swear. 18Behold, when we come into the land, thou shalt bind this line of scarlet thread in the window by which thou didst let us down: and thou shalt bring thy father, and thy mother, and thy brethren, and all thy father’s household, home to thee.1