1....The title of the Psalm is, “To David himself, when his son was pursuing him.” We know from the Books of Kings that this happened:...but we must recognise here another David, truly “strong in hand,” which is the explanation of David, even our Lord Jesus Christ. For all those events of past time were figures of things to come. Let us seek then in this Psalm our Lord and Saviour Jesus Christ, announcing Himself beforehand in His prophecy, and foretelling what should happen at this time by things which were done long ago. For He Himself foretold Himself in the Prophets: for He is the Word of God. Nor did they say ought of this kind, save when filled with the Word of God. They announced then Christ, being filled with Christ, they went before Him about to come, and He deserted not them going before....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)