“When a man vows a vow to יהוה, or swears an oath to bind himself by some agreement, he does not break his word, he does according to all that comes out of his mouth.
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, and your mother, and your brothers, and all your father’s household to your own home.