1 Samuel 25:39

How could David rejoice at the death of his enemy? Answ. Although it may be said that he rejoiced not in Nabal's death as such, but only in the declaration of God's justice in punishing so great a wickedness; which was an honour to God, and a document, and therefore a benefit to mankind, and so a public good, and cause of joy; yet the matter is not weighty, if we confess that this was another instance of human infirmity in David, and that it is not proposed for our imitation, but for our caution. Yet it may be further said, that this was not purely an act of private revenge, because David was a public person, and anointed king; and therefore Nabal's reproach cast upon David above, 1 Samuel 25:10,11, was a contempt of God, and of his ordinance and appointment; which was vindicated by this remarkable judgment. Hath kept his servant from evil, i.e. from the sin of bloodshed and self-revenge, 1 Samuel 25:33. David sent, to wit, messengers; which he thought fitter than to go himself; partly because if he had met with a repulse, it had been less ignominious; and partly because he would leave her to her freedom and choice, and would not so much as seem to take her by violence. But this doubtless was not done immediately after Nabal's death, but in some convenient space of time after it; though such circumstances be commonly omitted in the sacred history, which gives only the threads and most important passages of things.