Genesis 42:15 in the King James Version
Hereby ye shall be proved: By the life of Pharaoh ye shall not go forth hence, except your youngest brother come hither.
Context
14 Joseph said to them, “It is like I told you, saying, ‘You are spies!’
15 By this you shall be tested. By the life of Pharaoh, you shall not go out from here, unless your youngest brother comes here.
16 Send one of you, and let him get your brother, and you shall be bound, that your words may be tested, whether there is truth in you, or else by the life of Pharaoh surely you are spies.”