18 On the third day Joseph said to them, "I am a God-fearing man. If you do as I say, you will live. 19 If 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. 20 But you must bring your youngest brother back to me. This will prove that you are telling the truth, and you will not die." To this they agreed.
21 Speaking among themselves, they said, "Clearly we are being punished because of what we did to Joseph long ago. We saw his anguish when he pleaded for his life, but we wouldn't listen. That's why we're in this trouble." 22 "Didn't I tell you not to sin against the boy?" Reuben asked. "But you wouldn't listen. And now we have to answer for his blood!" 23 Of course, they didn't know that Joseph understood them, for he had been speaking to them through an interpreter. 24 Now he turned away from them and began to weep. When he regained his composure, he spoke to them again. Then he chose Simeon from among them and had him tied up right before their eyes.
Matthew Henry's Commentary on Genesis 42:18-24
Commentary on Genesis 42:7-20
(Read Genesis 42:7-20)
Joseph was hard upon his brethren, not from a spirit of revenge, but to bring them to repentance. Not seeing his brother Benjamin, he suspected that they had made away with him, and he gave them occasion to speak of their father and brother. God, in his providence, sometimes seems harsh with those he loves, and speaks roughly to those for whom yet he has great mercy in store. Joseph settled at last, that one of them should be left, and the rest go home and fetch Benjamin. It was a very encouraging word he said to them, "I fear God;" as if he had said, You may be assured I will do you no wrong; I dare not, for I know there is one higher than I. With those that fear God, we may expect fair dealing.
Commentary on Genesis 42:21-24
(Read Genesis 42:21-24)
The office of conscience is to bring to mind things long since said and done. When the guilt of this sin of Joseph's brethren was fresh, they made light of it, and sat down to eat bread; but now, long afterward, their consciences accused them of it. See the good of afflictions; they often prove the happy means of awakening conscience, and bringing sin to our remembrance. Also, the evil of guilt as to our brethren. Conscience now reproached them for it. Whenever we think we have wrong done us, we ought to remember the wrong we have done to others. Reuben alone remembered with comfort, that he had done what he could to prevent the mischief. When we share with others in their sufferings, it will be a comfort if we have the testimony of our consciences for us, that we did not share in their evil deeds, but in our places witnessed against them. Joseph retired to weep. Though his reason directed that he should still carry himself as a stranger, because they were not as yet humbled enough, yet natural affection could not but work.