Genesis 42:21-23 (New International Version)

 ²¹ They 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 upon us."

 ²² Reuben 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." ²³ They did not realize that Joseph could understand them, since he was using an interpreter.