1 Samuel 18:17-19

17Saul told David, “Here is my oldest daughter Merab. I’ll give her to you as a wife if you will be a warrior for me and fight the Lord’s battles.” But Saul was thinking, “I don’t need to raise a hand against him; let the hand of the Philistines be against him.”

18Then David responded, “Who am I, and what is my family or my father’s clan in Israel that I should become the king’s son-in-law?”

19When it was time to give Saul’s daughter Merab to David, she was given to Adriel the Meholathite as a wife.