1 Samuel 18:21-22, 29

And Saul said, I will give him her, that she may be a snare to him, and that the hand of the Philistines may be against him. Wherefore Saul said to David, Thou shalt this day be my son-in-law a second time. And Saul commanded his servants, saying, Commune with David secretly, and say, Behold, the king hath delight in thee, and all his servants love thee: now therefore be the king’s son-in-law.

And Saul was yet the more afraid of David; and Saul was David’s enemy continually.