Genesis 42:18-20

42:18 On the third day Joseph said to them, “Do as I say and you will live, for I fear God. 42:19 If you are honest men, leave one of your brothers confined here in prison while the rest of you go and take grain back for your hungry families. 42:20 But you must bring your youngest brother to me. Then your words will be verified and you will not die.” They did as he said.