Joshua 2:12, 17-21 (NKJV)
12 Now therefore, I beg you, swear to me by the LORD, since I have shown you kindness, that you also will show kindness to my father’s house, and give me a true token,
17 So the men said to her: “We will be blameless of this oath of yours which you have made us swear,
18 unless, when we come into the land, you bind this line of scarlet cord in the window through which you let us down, and unless you bring your father, your mother, your brothers, and all your father’s household to your own home.
19 So it shall be that whoever goes outside the doors of your house into the street, his blood shall be on his own head, and we will be guiltless. And whoever is with you in the house, his blood shall be on our head if a hand is laid on him.
20 And if you tell this business of ours, then we will be free from your oath which you made us swear.”
21 Then she said, “According to your words, so be it.” And she sent them away, and they departed. And she bound the scarlet cord in the window.