1 Samuel 18:16

Therefore Saul removed him from his presence, and made him his captain over a thousand; and he went out and came in before the people.

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

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

Saul 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.”

David 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?”

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