1 Samuel 18:21-22

18:21 Saul said, “I will give her to him so that she may become a snare to him and the hand of the Philistines may be against him.” So Saul said to David, “Today is the second time for you to become my son-in-law.”

18:22 Then Saul instructed his servants, “Tell David secretly, ‘The king is pleased with you, and all his servants like you. So now become the king’s son-in-law.”

1 Samuel 18:29

18:29 Saul became even more afraid of him. Saul continued to be at odds with David from then on.