Genesis 42:16

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 kept in prison, that your words may be proved, whether there be any truth in you: or else by the life of Pharaoh surely ye are spies.

¹⁷  And he put them all together into ward three days.

¹⁸  And Joseph said unto them the third day, This do, and live; for I fear God: