1 Samuel 18:20, 27

Now Michal, Saul’s daughter, loved David. When they told Saul, the thing was agreeable to him.

David rose up and went, he and his men, and struck down two hundred men among the Philistines. Then David brought their foreskins, and they gave them in full number to the king, that he might become the king’s son-in-law. So Saul gave him Michal his daughter for a wife.