1 Samuel 18:18-23
18 But David said to Saul, “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?”
19 So when the time came for Merab, Saul’s daughter, to be given to David, she was given in marriage to Adriel of Meholah.
20 Now Saul’s daughter Michal was in love with David, and when they told Saul about it, he was pleased.
21 “I will give her to him,” he thought, “so that she may be a snare to him and so that the hand of the Philistines may be against him.” So Saul said to David, “Now you have a second opportunity to become my son-in-law.”
22 Then Saul ordered his attendants: “Speak to David privately and say, ‘Look, the king is pleased with you, and his attendants all like you; now become his son-in-law.’”
23 They repeated these words to David. But David said, “Do you think it is a small matter to become the king’s son-in-law? I’m only a poor man and little known.”