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They gathered the bones of them that were hanged ... And after that God was intreated for the land. 21:13
Trivia: Which of David's sons killed his half-brother for raping his sister?
David tells one of his "young men" to kill the Amalekite messenger who claimed to have mercifully killed Saul at Saul's own request. 1:15
David asks God if he should kill some more Philistines. God says yes, and he'll even help. So David and God "smote the Philistines" again. 5:19, 25
"They left their images, and David and his men burned them." 5:21