13 In any case thou shalt deliver him the pledge again when the sun goeth down, that he may sleep in his own raiment, and bless thee: and it shall be righteousness unto thee before the LORD thy God.
Our brother becomes our debtor when our neighbor is shown to have committed some sin against us. For we call sins debts. Thus the sinful servant is told, “I have forgiven you your whole debt.” And each day in the Lord’s Prayer we pray, “Forgive us our debts as we forgive our debtors.” We receive a pledge from our debtor when we receive a confession of sin from him who is known to have sinned against us. His confession bids us to forgive the sin he has committed against us. If he confesses the sin he has committed and seeks pardon, he has already given a pledge for his debt. It is no wonder that we are bidden to return the pledge before sunset. Before the sun of justice sets in us because our hearts are grieved, we ought to accept his confession of sin. For it was he who made his confession of guilt to us. He has remembered that he has sinned against us. Let him soon feel forgiveness for his sin from us.
[AD 606] Paterius on Deuteronomy 24:13