So Saul said, "I will give her to him, that she may be a snare to him, and that the hand of the Philistines may be against him." Therefore Saul said to David a second time, "You shall be my son-in-law today."
1 Samuel 18:21
Surrounding context
18:20 Now Michal, Saul's daughter, loved David. And they told Saul, and the thing pleased him.
18:21 So Saul said, "I will give her to him, that she may be a snare to him, and that the hand of the Philistines may be against him." Therefore Saul said to David a second time, "You shall be my son-in-law today."
18:22 And Saul commanded his servants, "Communicate with David secretly, and say, "Look, the king has delight in you, and all his servants love you. Now therefore, become the king's son-in-law."'