David Marries Michal

17 Then Saul said to David, "Here is 1my elder daughter Merab. 2I will give her to you for a wife. Only be valiant for me 3and fight the LORD's battles." For Saul thought, "Let not my hand be against him, 4but let the hand of the Philistines be against him."
References for 1 Samuel 18:17