Genesis 42:16 YLT

¹⁴  And Joseph saith unto them, 'This 'is' that which I have spoken unto you, saying, Ye 'are' spies,

¹⁵  by this ye are proved: Pharaoh liveth! if ye go out from this -- except by your young brother coming hither;

¹⁶  send one of you, and let him bring your brother, and ye, remain ye bound, and let your words be proved, whether truth be with you: and if not -- Pharaoh liveth! surely ye 'are' spies;'

¹⁷  and he removeth them unto charge three days.

¹⁸  And Joseph saith unto them on the third day, 'This do and live; God I fear!