The Author of the Psalms, sings praises to an unknown Lord.

Psalm 24  by King David (if he ever lived and was ever a King) 1 The earth is the Lord’s, and the fullness thereof; the world, and they that dwell therein. 2 For he hath founded it upon the seas, and established it upon the floods. 3 Who shall ascend into the hill of the Lord? or who shall stand in his holy place? 4 He that hath clean hands, and a pure heart; who hath not lifted up his soul unto vanity, nor sworn deceitfully. 5 He shall receive the blessing from the Lord, and righteousness from the God of his salvation. 6 This is the generation of them that seek him, that seek thy face, O Jacob. Selah. 7 Lift up your heads, O ye gates; and be ye lift up, ye everlasting doors; and the King of glory shall come in. 8 Who is this King of glory? The Lord strong and mighty, the Lord mighty in battle. 9 Lift up your heads, O ye gates; even lift them up, ye everlasting doors; and the King of glory shall come in. 10 Who is this King of glory? The Lord of hosts, he is the King of glory. Selah. "Psalm 24," public domain.

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COMMENTARY

1. He owns us; we are slaves.
2. Sea. It, the Earth, is established on the waters, a tidal flood, with no real place. The Author may be a Cretan or Phoenician. Probably not Sumerian/Ur or Egyptian descendant. They had very different relationship to Diety. 
3. Who is who?  He can come close to the Lord?
4. "He" a male. 

He with "clean hands".  Has not done the dirty. 

He with a "pure heart". Not self-serving, vain, nor a liar.

5. "He" a male, gets the blessing.  And is made righteous by salvation. Diety is a Savior. Like Astarte, Isis, Dionysius, Orpheus, and Ieus Christo, aka Ieusus Christo.
6. Who are we?  "the generation" that seeks the face of the Lord.  And in the millennia, no one. Religion is the search for the face of the Lord. Not the finding.
7. Gates.  The gates with heads, the doors with everlastingness. A "King of Glory" awaits to enter. This is always a reference to death. Which is a reference to eternity.
8. Yet, asking "Who is this King?"  The author really does not know for certain, but answers only with the tautology: "The Lord…is the King".