Genesis 42:15-20

WEB_Strongs(i)
  15 H2063 By H974 this you shall be tested. H2416 By the life H6547 of Pharaoh, H3318 you shall not go out H6996 from here, unless your youngest H251 brother H935 comes here.
  16 H7971 Send H259 one H3947 of you, and let him get H251 your brother, H631 and you shall be bound, H1697 that your words H974 may be tested, H571 whether there is truth H854 in H3808 you, or else H2416 by the life H6547 of Pharaoh H7270 surely you are spies."
  17 H622 He put them all together H4929 into custody H7969 for three H3117 days.
  18 H3130 Joseph H559 said H7992 to them the third H3117 day, H6213 "Do H2421 this, and live, H3373 for I fear H430 God.
  19 H3651 If you are honest H259 men, then let one H251 of your brothers H631 be bound H1004 in your H4929 prison; H3212 but you go, H935 carry H7668 grain H7459 for the famine H1004 of your houses.
  20 H935 Bring H6996 your youngest H251 brother H1697 to me; so will your words H539 be verified, H4191 and you won't die." H6213 They did so.