Genesis 42:21

We are verily guilty This is the just punishment of that wickedness which we committed against our brother. Though we could conceal it from men, we now see and feel it was known to God, who is reckoning with us for it. Thus the divine vengeance overtakes them, and conscience tortures them for a sin committed twenty years before, and their affliction, we may hope, brought them to repentance. We saw the anguish of his soul when he besought us This particular is not mentioned in the history of this affair, recorded chap. 37., from which circumstance we learn, that the silence of Scripture concerning certain matters, is not a sufficient proof that they did not take place. We do not read that Joseph's brethren were brought to feel this remorse of conscience, or made this confession to each other, during their three days of imprisonment; but now, when the matter was come to some issue, and they saw themselves still embarrassed, they began to relent. Perhaps Joseph's mention of the fear of God, put them upon consideration, and extorted this reflection from them.