1 Samuel 18:17-21

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!”

19So when the time came for Saul to give his daughter Merab in marriage to David, he gave her instead to Adriel, a man from Meholah.

20In the meantime, Saul’s daughter Michal had fallen in love with David, and Saul was delighted when he heard about it.

21“Here’s another chance to see him killed by the Philistines!” Saul said to himself. But to David he said, “Today you have a second chance to become my son-in-law!”