Don't be like Cain, who belonged to the devil and murdered his own brother. Why did he murder him? He did it because his brother was good, and he was evil.
David and his men went there and fiercely attacked the Philistines. They killed many of them, then led away their cattle, and rescued the people of Keilah.
David had just been saying, “I wasted my time guarding Nabal's things in the desert and keeping them from being stolen! I was good to him, and now he pays me back with insults.