1 Samuel 18:18-23

18And David said to Saul, "Who am I, and who are my relatives, my father's clan in Israel, that I should be son-in-law to the king?"

19But at the time when Merab, Saul's daughter, should have been given to David, she was given to Adriel the Meholathite for a wife.

20Now Saul's daughter Michal loved David. And they told Saul, and the thing pleased him.

21Saul thought, "Let me give her to him, that she may be a snare for him and that the hand of the Philistines may be against him." Therefore Saul said to David a second time, "You shall now be my son-in-law."

22And Saul commanded his servants, "Speak to David in private and say, 'Behold, the king has delight in you, and all his servants love you. Now then become the king's son-in-law.'"

23And Saul's servants spoke those words in the ears of David. And David said, "Does it seem to you a little thing to become the king's son-in-law, since I am a poor man and have no reputation?"