Psalms 22:31

They shall come, and shall declare his righteousness unto a people that shall be born, that he hath done this.

Declare his righteousness - i:e., God's faithfulness to His promises in delivering Messiah, and saving His seed. "They," the "seed" or "generation," "shall come" - i:e., go forth on the theater of the world (Hengstenberg).

That shall be born - `that shall have been (then) born'-namely, in the next generation (cf. Psalms 102:18).

That he hath done this - namely, that God hath completed redemption in the deliverance of Christ. That work was consummated virtually when the light of the Father's countenance returned upon Christ just before His death. In allusion to this verse, as He began with "My God, my God, why hast thou forsaken me?" (Psalms 22:1), so He ended with this, very word here used in the last verse of the psalm, "It is finished," or 'done' (John 19:30). The work was done or finished actually at the resurrection, when the Father declared Christ to be the Son of God with power (Romans 1:4).