121 And the Lord sent Nathan to David. And Nathan came to him and said, There were two men in the same town: one a man of great wealth, and the other a poor man. 2 The man of wealth had great numbers of flocks and herds; 3 But the poor man had only one little she-lamb, which he had got and taken care of: from its birth it had been with him like one of his children; his meat was its food, and from his cup it took its drink, resting in his arms, and it was like a daughter to him. 4 Now a traveller came to the house of the man of wealth, but he would not take anything from his flock or his herd to make a meal for the traveller who had come to him, but he took the poor man's lamb and made it ready for the man who had come. 5 And David was full of wrath against that man; and he said to Nathan, By the living Lord, death is the right punishment for the man who has done this: 6 And he will have to give back four times the value of the lamb, because he has done this and because he had no pity.
Matthew Henry's Commentary on 2 Samuel 12:1-6
Commentary on 2 Samuel 12:1-14
(Read 2 Samuel 12:1-14)
God will not suffer his people to lie still in sin. By this parable Nathan drew from David a sentence against himself. Great need there is of prudence in giving reproofs. In his application, he was faithful. He says in plain terms, Thou art the man. God shows how much he hates sin, even in his own people; and wherever he finds it, he will not let it go unpunished. David says not a word to excuse himself or make light of his sin, but freely owns it. When David said, I have sinned, and Nathan perceived that he was a true penitent, he assured him his sin was forgiven. Thou shalt not die: that is, not die eternally, nor be for ever put away from God, as thou wouldest have been, if thou hadst not put away the sin. Though thou shalt all thy days be chastened of the Lord, yet thou shalt not be condemned with the world. There is this great evil in the sins of those who profess religion and relation to God, that they furnish the enemies of God and religion with matter for reproach and blasphemy. And it appears from David's case, that even where pardon is obtained, the Lord will visit the transgression of his people with the rod, and their iniquity with stripes. For one momentary gratification of a vile lust, David had to endure many days and years of extreme distress.