1 Samuel 18:20-21

And Michal Saul's daughter loved David: and they told Saul, and the thing pleased him. {pleased him: Heb. was right in his eyes} 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.