C. F. Keil and Franz Delitzsch on 1 Samuel 25:12-13

The messengers returned to David with this answer. The churlish reply could not fail to excite his anger. He therefore commanded his people to gird on the sword, and started with 400 men to take vengeance upon Nabal, whilst 200 remained behind with the things. 1 Samuel 25:14-31

However intelligible David’s wrath may appear in the situation in which he was placed, it was not right before God, but a sudden burst of sinful passion, which was unseemly in a servant of God. By carrying out his intention, he would have sinned against the Lord and against His people. But the Lord preserved him from this sin by the fact that, just at the right time, Abigail, the intelligent and pious wife of Nabal, heard of the affair, and was able to appease the wrath of David by her immediate and kindly interposition.