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Biblical citations in the hymnal: Psalm 24:7-10, Isaiah 60:4-5
Psalm 24:7-10: "Lift up your heads, O gates! And be lifted up, O ancient doors, that the King of glory may come in. Who is this King of glory? The LORD, strong and mighty, the LORD, mighty in battle! Lift up your heads, O gates! And lift them up, O ancient doors, that the King of glory may come in. Who is this King of glory? The LORD of hosts, he is the King of glory!"
Isaiah 60:4-5: "Lift up your eyes all around, and see; they all gather together, they come to you; your sons shall come from afar, and your daughters shall be carried on the hip. Then you shall see and be radiant; your heart shall thrill and exult, because the abundance of the sea shall be turned to you, the wealth of the nations shall come to you."
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The text is public domain:
Lift up your heads, ye mighty gates!
Behold, the King of glory waits.
The King of kings is drawing near;
The Savior of the world is here.
Life and salvation He doth bring;
Therefore rejoice and gladly sing.
To God the Father raise
Your joyful songs of praise.
A righteous Helper comes to thee;
His chariot is humility,
His kingly crown is holiness,
His scepter, pity in distress.
The end of all our woe He brings;
Therefore the earth is glad and sings.
To Christ the Savior raise
Your grateful hymns of praise.
How blest the land, the city blest,
Where Christ the ruler is confessed!
O peaceful hearts and happy homes
To whom this King in triumph comes!
The cloudless sun of joy is He
Who comes to set His people free.
To God the Spirit raise
Your happy shouts of praise.
Fling wide the portals of your heart;
Make it a temple set apart
From earthly use for heav'n's employ,
Adorned with prayer and love and joy.
So shall your Sov'reign enter in
And new and nobler life begin.
To God alone be praise
For word and deed and grace!
Redeemer, come and open wide
My heart to Thee; here, Lord, abide!
O enter with Thy grace divine;
Thy face of mercy on me shine.
Thy Holy Spirit guide us on
Until our glorious goal is won.
Eternal praise and fame
We offer to Thy name.
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The first line of the first verse ("Lift up your heads, ye mighty gates!") is obviously from the Psalm text, and the rest of the hymn expands on that idea.
I can't really find anything in the hymn text that specifically points to the Isaiah text that's cited, although lines like "Life and salvation He doth bring," "How blest the land, the city blest, / Where Christ the ruler is confessed! / O peaceful hearts and happy homes / To whom this King in triumph comes!" and "new and nobler life" might be extensions of "the abundance" and "the wealth" mentioned in Isaiah.
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The line "Thy face of mercy on me shine" in the last verse hints at the Aaronic blessing: "The LORD bless you and keep you; the LORD make his face to shine upon you and be gracious to you; the LORD lift up his countenance upon you and give you peace" (Numbers 6:24-26). However, that Numbers text isn't listed in the hymnal.
