The story of Saul and David prefigures in many ways the story of the conflict between Lucifer and Jesus, our Messiah.
Saul was chosen by God and was anointed by Samuel as king (1 Samuel 9:16,-17; 10:1). He was a beautiful man – more attractive and taller than any other man at the time (1 Samuel 9:2). He sinned against God (1 Samuel 13:8-14; 15:1-31), and God told Samuel to anoint David as king (1 Samuel 16:13). Even as God’s chosen and anointed king, David spent years in the wilderness being hunted and persecuted by Saul. Saul and his sons were finally killed in battle (! Samuel 31:1-6). David ascended the throne as king of Judah (2 Samuel 2:4), and then of all of Israel (2 Samuel 5:1-3).
Lucifer was the most beautiful of the angels. He was highly intelligent and powerful until he sinned against God and was thrown out of heaven (Revelation 12:9). Like David in the story of the kings of Israel, Jesus has been anointed the true King of the world, but His people have been “in the wilderness” being hunted and persecuted by the Adversary/satan for a long time (Revelation 21: 12, 17). Jesus will return, and He will wage war against the devil and his minions (Revelation 19:11-20:3), and He will be installed as the true King of this world (Revelation:19:15). God will have the mighty angel bind the devil (Revelation 20:1-3), and God will ultimately destroy the enemy, Satan, Himself in the eternal fire (Revelation 20:10).
Our Father is so faithful to reveal the nature of His plan for this world and for humanity in His Word, the Bible. He often uses the stories and people of the Old Testament to give His people a glimmer/foretaste of what He has planned. Saul/David and Lucifer/Jesus Messiah are an example of His goodness in revealing Himself and His plans to us.