Genesis 42:14-20

Joseph said to them, “It’s just as I said; you are spies! And here is how I’ll test you: unless your younger brother comes and presents himself here before me, then as surely as Pharaoh lives, you shall not depart from here! One of you must go and bring me your brother, while the rest of you will remain here in confinement. This way I will test your words to see if the story you have told me is true. If not, as surely as Pharaoh lives, you are spies!” He placed them all in prison together for three days. On the third day, Joseph said to them, “Do as I say and you will live. I am a man who respects God. If you are as honest as you say you are, then I will keep just one of your brothers here in confinement while the rest of you carry grain home for your starving families. You must return with your youngest brother so that I may verify your story, and that you may not die.” So they agreed to do so.