1 Samuel 18:17-18

17One day Saul said to David, “I am ready to give you my older daughter, Merab, as your wife. But first you must prove yourself to be a real warrior by fighting the Lord’s battles.” For Saul thought, “I’ll send him out against the Philistines and let them kill him rather than doing it myself.”

18“Who am I, and what is my family in Israel that I should be the king’s son-in-law?” David exclaimed. “My father’s family is nothing!”