A HYMN OF VICTORY.
This psalm foretells the salvation of all the nations and predicts victory over enemies. It also gave a glimpse of the apostolic choir urging all the nations to hymn singing. Now, clapping is typical of victory, and shouting is the sound of victors. So the meaning of this psalm concurs with the previous one: that one foretold the victory indicated after turmoil and disturbances, and this one likewise recommends those who gained the victory to offer the hymn to the provider of the victory. He is revealed to you all, he says, as king most high and fearsome. While in ancient times this was known to Jews alone, in the present time it has been made clear also to the whole human race.
Commentary on the Psalms 47.1