1 Samuel (Author Compiled by Isaiah from records of Samuel, David, Nathan, and Gad.)
18:21And 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.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.