1 Samuel 18:16

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?”