What does Psalm 21:5 mean?

David rejoices in the glory the Lord bestowed on him through victories over his enemies. David does not take credit for this honor. Rather, the glory of the king is great through the Lord's salvation. In fulfillment of the promise in the covenant He made with David, the Lord gave David rest from all his enemies (2 Samuel 7:11). David humbly acknowledged that the Lord delivered him from his enemies and bestowed splendor and majesty on him.

Certainly, the Lord Jesus, the Son of David, was delivered from death by the power of God the Father. Ephesians 1:20 affirms that God the Father (along with the rest of the Trinity) raised Jesus from the dead. The following verses in Ephesians describe the glory, splendor, and majesty that the Father bestowed on Jesus when He delivered Him from death. He seated Jesus at His right hand "far above all rule and authority and power and dominion, and above every name" (Ephesians 1:20–21). He subjected all things to Him and made Him head of the church (Ephesians 1:22–23). No one else in the universe compares with Jesus, the Son of David, in glory, splendor, and majesty!