The Lord is here telling the story, as an illustration of the time when Christ shall come as the Perfect King. He comes in glory and power (see chart also Rev. 19:11-16). He shall completely destroy His enemies (as David does in this chapter).
V.2 Notice David’s crown. Turn to Revelation 19:12.
V.3 Can be a picture of the severest punishment which shall fall on the Gentile world when the Lord Jesus shall come to be King (Read those verses in Rev. 19:11-16).