1 Samuel 18:27-30

David took his men with him and went out and killed two hundred Philistines and brought back their foreskins. They counted out the full number to the king so that David might become the king’s son-in-law. Then Saul gave him his daughter Michal in marriage. When Saul realized that the LORD was with David and that his daughter Michal loved David, Saul became still more afraid of him, and he remained his enemy the rest of his days. The Philistine commanders continued to go out to battle, and as often as they did, David met with more success than the rest of Saul’s officers, and his name became well known.