1 Samuel 18:18

14David behaved himself wisely in all his ways; and the LORD was with him.

15When Saul saw that he behaved himself very wisely, he stood in awe of him.

16But all Israel and Judah loved David; for he went out and came in before them.

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.’”