Genesis 42:13

10 And they said unto him, Nay, my lord, but to buy food are thy servants come.

11 We are all one man`s sons; we are true men, thy servants are no spies.

12 And he said unto them, Nay, but to see the nakedness of the land ye are come.

13 And they said, We thy servants are twelve brethren, the sons of one man in the land of Canaan; and, behold, the youngest is this day with our father, and one is not.

14 And Joseph said unto them, That is it that I spake unto you, saying, Ye are spies:

15 hereby ye shall be proved: by the life of Pharaoh ye shall not go forth hence, except your youngest brother come hither.

16 Send one of you, and let him fetch your brother, and ye shall be bound, that your words may be proved, whether there be truth in you: or else by the life of Pharaoh surely ye are spies.