Genesis 42:16-19

16One of you must go and get your brother. I’ll keep the rest of you here in prison. Then we’ll find out whether or not your story is true. By the life of Pharaoh, if it turns out that you don’t have a younger brother, then I’ll know you are spies.”

17So Joseph put them all in prison for three days.

18On the third day Joseph said to them, “I am a God-fearing man. If you do as I say, you will live.

19If you really are honest men, choose one of your brothers to remain in prison. The rest of you may go home with grain for your starving families.