1 Samuel 18:22-25

22And Saul commanded his servants, “Communicate with David secretly, and say, ‘Look, the king has delight in you, and all his servants love you. Now therefore, become the king’s son-in-law.’ ”

23So Saul’s servants spoke those words in the hearing of David. And David said, “Does it seem to you a light thing to be a king’s son-in-law, seeing I am a poor and lightly esteemed man?”

24And the servants of Saul told him, saying, “In this manner David spoke.”

25Then Saul said, “Thus you shall say to David: ‘The king does not desire any dowry but one hundred foreskins of the Philistines, to take vengeance on the king’s enemies.’ ” But Saul thought to make David fall by the hand of the Philistines.