What does Psalm 21:13 mean?

The end of Psalm 21 records the swelling praise of the congregation and of David for victories won by the Lord's power. They ask the Lord to exalt Himself as they sing and praise His power. David and the congregation did not glory in themselves but in the Lord. When David was just a youth, he used his simple sling and a stone to defeat the giant Goliath—but David not indulge in self-glory. He approached Goliath with confidence in the Lord and said, "I come to you in the name of the LORD of hosts, the God of the armies of Israel…This day the LORD will deliver you into my hand" (1 Samuel 17:45–46).

Christians share a victory over their final enemy, death, but the praise for the victory goes to the Lord and not to us. The apostle Paul wrote: "Death is swallowed up in victory…thanks be to God, who gives us the victory through our Lord Jesus Christ" (1 Corinthians 15:54, 57).