1 Samuel 25:10

There be many servants now a days that break away. — This evident insult indicates that Nabal was of the faction of Saul at this time — was reckoned among those who hated David. It was the report of these words, doubtless, which so furiously excited David. In Nabal, the rich sheep-master, the churlish refuser of the fairly earned gift, he saw a deadly political adversary — one who, with men like Doeg and Cush, would hunt him down like a wild beast. Without this explanation, David’s wrath and determination to take such speedy and bloody vengeance on a mere selfish churl is inexplicable. With the light, however, which such an open declaration of deadly hostility on the part of Nabal throws on the transaction, the subsequent passionate conduct of David, although deeply blameable, is not difficult to understand.