While evading Saul, David and his men lived by raiding. In this he spared Israelites and even offered them protection from rival tribes. This forms the background for his marriage to Abigail. When her husband, the fool, refused to let David and his men share in a feast, David vowed to kill him and his men to avenge the insult. Abigail's quick action forestalled that event and when Nabal died, David married her. After David again spared Saul, he had had enough dodging and moved his operations out of Judah and into Philistia.
