1 Samuel 18:19-21

Young's Literal Translation

¹⁹ And it cometh to pass, at the time of the giving of Merab daughter of Saul to David, that she hath been given to Adriel the Meholathite for a wife.

²⁰ And Michal daughter of Saul loveth David, and they declare to Saul, and the thing is right in his eyes,

²¹ and Saul saith, `I give her to him, and she is to him for a snare, and the hand of the Philistines is on him;' and Saul saith unto David, `By the second -- thou dost become my son-in-law to-day.'