1 Samuel 18:20-21

Michal … loved David. Probably there was some short lapse of time between Merab's marriage and the growth of this affection, the news of which pleased Saul. He was not an ungenerous man, and possibly may have felt ashamed at having acted so meanly by David after having exposed him to danger. And yet evil thoughts again are uppermost, and his purposes are selfish; for either way Saul will be the gainer. David will probably be slain, he thinks, in trying to get the dowry asked of him; and if not, at all events he will himself be cleared of the stain of public dishonesty now resting upon him. Therefore Saul said to David. Not in person, which accounts for David giving no answer, but through his servants, as is recounted more fully afterwards.