1 Samuel 18:21 in the King James Version
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 in the one of the twain.
Context
20 Michal, Saul’s daughter, loved David; and they told Saul, and the thing pleased him.
21 Saul said, I will give her to him, that she may be a snare to him and that the hand of the Philistines may be against him. Therefore Saul said to David a second time, “You shall today be my son-in-law.”
22 Saul commanded his servants, “Talk with David secretly, and say, ‘Behold, the king has delight in you, and all his servants love you. Now therefore be the king’s son-in-law.’”