David said - I have sinned greatly - We know not exactly in what this sin consisted. I have already hinted, 2 Samuel 24:1, that probably David now began to covet an extension of empire, and purposed to unite some of the neighboring states with his own; and having, through the suggestions of Satan or some other adversary, (for so the word implies), given way to this covetous disposition, he could not well look to God for help, and therefore wished to know whether the thousands of Israel and Judah might be deemed equal to the conquests which he meditated. When God is offended and refuses assistance, vain is the help of man.

And David's heart smote him, after that had numbered the people,.... For nine or ten months his conscience lay asleep, but now the thing was done, it is awakened, and accuses him for it, and he repents of it; now he began to see the pride and haughtiness of his heart; his vanity and confidence in the creature, which led him to it; aggravated by doing it without seeking to know the mind of God, and without giving him his due, the half shekel, according to the law, Exodus 30:12; intent only upon increasing his own revenue, as some think, intending to impose a poll tax upon the people when he had numbered them; and attempting to number a people who were not to be numbered; and numbering those who were under the age of twenty, and therefore the plague began before it was finished, 1 Chronicles 27:23,

and David said unto the Lord, I have sinned greatly in that I have done; he saw and owned his sin to be exceeding sinful, attended with very aggravating circumstances:

and now I beseech thee, Lord, take away the iniquity of thy servant; the guilt of it from his conscience, which lay heavy there, and suffer not the punishment it deserves to take place on him, but grant an application of pardon to him:

for I have done very foolishly; all sin is folly, and some sins are exceeding foolish, and so this appeared to David; or, "though I have done very foolishly" (b), yet forgive my sin, see Psalm 38:5.

(b) "quamvis", so Goassius notes it may be rendered; so Pool.

David's heart, i.e., his conscience, smote him, after he had numbered the people, or had given orders for the census to be taken. Having now come to a knowledge of his sin, he prayed to the Lord for forgiveness, because he had acted foolishly. The sin consisted chiefly in the self-exaltation which had led to this step (see the introductory remarks).

And David's heart smote him after that he had numbered the people. And David said unto the LORD, I have sinned greatly in that I have done: and now, I beseech thee, O LORD, take away the iniquity of thy servant; for I have done very foolishly.

2Sa 24:10-14. He, Having Three Plagues Propounded by GAD, Repents, and Chooses Three Days' Pestilence.

10-13. David's heart smote him after that he had numbered the people. And David said unto the Lord, I have sinned-The act of numbering the people was not in itself sinful; for Moses did it by the express authority of God. But David acted not only independently of such order or sanction, but from motives unworthy of the delegated king of Israel; from pride and vainglory; from self-confidence and distrust of God; and, above all, from ambitious designs of conquest, in furtherance of which he was determined to force the people into military service, and to ascertain whether he could muster an army sufficient for the magnitude of the enterprises he contemplated. It was a breach of the constitution, an infringement of the liberties of the people, and opposed to that divine policy which required that Israel should continue a separate people. His eyes were not opened to the heinousness of his sin till God had spoken unto him by His commissioned prophet.

24:10-15 It is well, when a man has sinned, if he has a heart within to smite him for it. If we confess our sins, we may pray in faith that God would forgive them, and take away, by pardoning mercy, that sin which we cast away by sincere repentance. What we make the matter of our pride, it is just in God to take from us, or make bitter to us, and make it our punishment. This must be such a punishment as the people have a large share in, for though it was David's sin that opened the sluice, the sins of the people all contributed to the flood. In this difficulty, David chose a judgment which came immediately from God, whose mercies he knew to be very great, rather than from men, who would have triumphed in the miseries of Israel, and have been thereby hardened in their idolatry. He chose the pestilence; he and his family would be as much exposed to it as the poorest Israelite; and he would continue for a shorter time under the Divine rebuke, however severe it was. The rapid destruction by the pestilence shows how easily God can bring down the proudest sinners, and how much we owe daily to the Divine patience.