1 Samuel 18:21

17Saul said to David, “Behold, my elder daughter Merab. I will give her to you as wife. Only be valiant for me, and fight the LORD’s battles.” For Saul said, “Don’t let my hand be on him, but let the hand of the Philistines be on him.”

18David said to Saul, “Who am I, and what is my life, or my father’s family in Israel, that I should be son-in-law to the king?”

19But at the time when Merab, Saul’s daughter, should have been given to David, she was given to Adriel the Meholathite as wife.

20Michal, Saul’s daughter, loved David; and they told Saul, and the thing pleased him.

21Saul 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 today be my son-in-law.”

22Saul commanded his servants, “Talk with David secretly, and say, ‘Behold, the king has delight in you, and all his servants love you. Now therefore be the king’s son-in-law.’”

23Saul’s servants spoke those words in the ears of David. David said, “Does it seem to you a light thing to be the king’s son-in-law, since I am a poor man and little known?”

24The servants of Saul told him, saying, “David spoke like this.”

25Saul said, “Tell David, ‘The king desires no dowry except one hundred foreskins of the Philistines, to be avenged of the king’s enemies.’” Now Saul thought he would make David fall by the hand of the Philistines.