“David and his men left and killed two hundred Philistines. He brought back the proof and showed it to Saul, so he could marry Michal. Saul agreed to let David marry Michal. Saul knew that she loved David, and he also realized that the LORD was helping David. But knowing those things made Saul even more afraid of David, and he was David's enemy for the rest of his life. The Philistine rulers kept coming to fight Israel, but whenever David fought them, he won. He was famous because he won more battles against the Philistines than any of Saul's other officers. ” [1 Samuel 18:27-30]
“If God is for us, who can be against us?”
As David continued to win battle after battle, Saul became extremely jealous. When he heard the songs of the women ascribing to David greater exploits than to himself, he became livid with rage. God sometimes uses evil to chastise evil; that is why he allowed Saul to be tormented by a distressing spirit. Twice the king tried to personally kill David, but both times David escaped. Then Saul made him..captain over a thousand soldiers, perhaps hoping that David would be killed while fighting the Philistines. But the Lord was with David, and his exploits attracted the attention of all Israel. “If God is for us, who can be against us?” [Romans:8:31]
The king’s daughter had been promised to the man who would kill the Philistine giant, so Merab, Saul’s older daughter, was offered to David. However, more victories would have to be won first. Saul hoped David would be killed in the process. When David expressed his social unworthiness to be son-in-law to the king, Merab was given to another man, which perhaps Saul’s way of trying to humiliate David. But Saul’s younger daughter, Michal, loved David, and Saul agreed to give her to him, provided he produced a dowry of one hundred Philistine foreskins.
Again Saul hoped to kill David by the hand of the Philistines. But David was not to be eliminated so easily. “..no weapon forged against you will prevail, and you will refute every tongue that accuses you. This is the heritage of the servants of the LORD, and this is their vindication from me," declares the LORD [Isaiah:54:17]. He returned with the bizarre dowry in double measure and won Michal as his bride. As continual military success made it clear the Lord was with David, Saul’s hatred and fear of him continued to grow.
David was playing the lyre
Saul: I'll pin David to the wall
“The next day an evil spirit from God came forcefully on Saul. He was prophesying in his house, while David was playing the lyre, as he usually did. Saul had a spear in his hand and he hurled it, saying to himself, “I’ll pin David to the wall.” But David eluded him twice. Saul was afraid of David, because the LORD was with David but had departed from Saul. ” [1 Samuel 18:10-12]