Genesis 42:17-23

17And he put them all in custody for three days. 18On the third day, Joseph said to them, “Do this and you will live, for I fear God: 19If you are honest men, let one of your brothers stay here in prison, while the rest of you go and take grain back for your starving households.

20But you must bring your youngest brother to me, so that your words may be verified and that you may not die.” This they proceeded to do.

21They said to one another, “Surely we are being punished because of our brother. We saw how distressed he was when he pleaded with us for his life, but we would not listen; that’s why this distress has come on us.” 22Reuben replied, “Didn’t I tell you not to sin against the boy? But you wouldn’t listen! Now we must give an accounting for his blood.”

23They did not realize that Joseph could understand them, since he was using an interpreter.