David is a remarkable type of Christ: When he was hunted by Saul, he foreshadowed Christ in His rejection, and when on the throne he was a type of Christ as a man of war, putting down His enemies previous to His peaceful reign in the millennium, typified in Solomon. The Lord Jesus is often called the Son of David, and yet He is David’s Lord, about which fact He Himself asked the Jews (Luke 20:41-44). In like manner, He is called the root and the offspring of David (Rev. 22:16); being God as well as man He could be both. He also has the key of David (Rev. 3:7; compare Isa. 22:22-24). He has the disposal of all things for the church, for the future kingdom on earth, and for the nations generally.
Concise Bible Dictionary