Thematic Bible: Custom of swearing by the life of the king

By this you shall be tested. By the life of Pharaoh you will not go out from here unless your youngest brother comes here. Send one of you, and let him bring your brother, but you will be kept in prison so that your words might be tested [to see] if [there is] truth with you. And if not, by the life of Pharaoh surely you [are] spies."