Genesis 42:16-18

Young's Literal Translation

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!