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Psalm 21 ESV
Who - David writing a song of praise to God.
What - David is praising the LORD for for his kingship the LORD has brought about and blessed with success and safety. David acknowledges it is by the LORD’S power he is enjoying this blessed and grateful moment. David also makes an indirect request. By stating his belief that God will defeat David’s enemies in the future, he is asking the LORD to continue to bless David’s kingship. David has no hesitations to ask the LORD to take violent action against his enemies. David sees his enemies as the LORD’S enemies. Given the idolatrous religions of the nations around Israel it is easy to see why David believes so.
As New Testament believers we can see how this song is completely fulfilled in Jesus, especially the last half of this psalm in Revelation.
When - No specific time is mentioned, but it must have been in the glory days of his reign. Probably in a time of blessing and prosperity.
Where - Unstated
Why - David wants to praise the LORD for His blessing and prosperity on David’s kingship. David also wants to ask God to continue blessing David’s kingship.