1st Samuel 18:17 And Saul said to David, Behold my elder daughter Merab, her will I give thee to wife: only be thou valiant for me, and fight the Lord's battles. For Saul said, Let not mine hand be upon him, but let the hand of the Philistines be upon him.
[Patriarchs & Prophets pp 652] To this proposal David's modest answer was, “Who am I? and what is my life, or my father's family in Israel, that I should be son-in-law to the king?” The monarch manifested his insincerity by wedding the princess to another. An attachment for David on the part of Michal, Saul's youngest daughter, afforded the king another opportunity to plot against his rival.
Michal's hand was offered the young man on condition that evidence should be given of the defeat and slaughter of a specified number of their national foes. “Saul thought to make David fall by the hand of the Philistines,” but God shielded His servant. David returned a victor from the battle, to become the king's son-in-law. “Michal Saul's daughter loved him,” and the monarch, enraged, saw that his plots had resulted in the elevation of him whom he sought to destroy.
He was still more assured that this was the man whom the Lord had said was better than he, and who should reign on the throne of Israel in his place. Throwing off all disguise, he issued a command to Jonathan and to the officers of the court to take the life of the one he hated. Jonathan revealed the king's intention to David and bade him conceal himself while he would plead with his father to spare the life of the deliverer of Israel.
1st Samuel 18:21 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.
May God add His blessing to the study of His word. “Good night” and God bless!