1 Samuel 18:22-25

22Saul then ordered his servants, “Speak to David in private and tell him, ‘Look, the king is pleased with you, and all his servants love you. Therefore, you should become the king’s son-in-law.’”

23Saul’s servants reported these words directly to David, but he replied, “Is it trivial in your sight to become the king’s son-in-law? I am a poor commoner.”

24The servants reported back to Saul, “These are the words David spoke.”

25Then Saul replied, “Say this to David: ‘The king desires no other bride-price except a hundred Philistine foreskins, to take revenge on his enemies.’” Actually, Saul intended to cause David’s death at the hands of the Philistines.