Saul thought, “Let me give her to him, that she may be a snare for him and that the hand of the Philistines may be against him.” Therefore Saul said to David a second time, “You shall now be my son-in-law.”
Saul had now, in effect, proclaimed war with David. He began in open hostility when he threw the javelin at him. Now we are here told how his enmity proceeded, and how David received the attacks of it. I. See how Saul expressed his malice against David. 1. He was afraid of him, Sa1 18:12.
Commenting on 1 Samuel 18:12-30
And Saul commanded his servants, saying, commune with David secretly,.... And persuade him to marry Michal, and assure him of Saul's real regard to him, and good intention towards him; for it seems that David being ill used in the affair of his eldest daughter, did not listen to the proposals of Saul as to the youngest, and therefore Saul took this method to bring...
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. (i) So his hypocrisy appears, for under pretence of favour he sought his destruction.