The Psalm of David is this:
The earth is the Lord’s, and the fullness thereof; the world, and all that dwell therein. He has rounded it upon the seas, and prepared it upon the floods. Who shall ascend into the hill of the Lord? Or who shall stand in His holy place? He that is clean of hands and pure of heart: who has not received his soul in vain, and has not sworn guilefully to his neighbour: he shall receive blessing from the Lord, and mercy from God his Saviour. This is the generation of them that seek the Lord, that seek the face of the God of Jacob. Lift up your gates, you rulers; and be lifted up, you everlasting doors; and the King of glory shall come in. Who is this King of glory? The Lord strong and mighty in battle. Lift up your gates, you rulers; and be lifted up, you everlasting doors; and the King of glory shall come in. Who is this King of glory? The Lord of hosts, He is the King of glory.
Accordingly, it is shown that Solomon is not the Lord of hosts; but when our Christ rose from the dead and ascended to heaven, the rulers in heaven, under appointment of God, are commanded to open the gates of heaven, that He who is King of glory may enter in, and having ascended, may sit on the right hand of the Father until He make the enemies His footstool, as has been made manifest by another Psalm. For when the rulers of heaven saw Him of uncomely and dishonoured appearance, and inglorious, not recognising Him, they inquired, ‘Who is this King of glory?’ And the Holy Spirit, either from the person of His Father, or from His own person, answers them, ‘The Lord of hosts, He is this King of glory.’ (Dialogue with Trypho 36)
St. Irenaeus of Lyons died ca. 202
And the same says David again: Lift up your gates, ye rulers; and be ye lift up, ye everlasting gates, and the King of glory shall come in. For the everlasting gates are the heavens. But because the Word descended invisible to created things, He was not made known in His descent to them. Because the Word was made flesh, He was visible in His ascension; and, when the powers saw Him, the angels below cried out to those who were on the firmament: Lift up your gates; and be ye lift up, ye everlasting gates, that the King of glory may come in. And when they marvelled and said: Who is this? those who had already seen Him testified a second time: The Lord strong and mighty, he is the King of glory. (Proof of Apostolic Preaching 84)
St. Hippolytus of Rome ca. 170-235
He comes to the heavenly gates: angels accompany Him: and the gates of heaven were closed. For He has not yet ascended into heaven. Now first does He appear to the powers of heaven as flesh ascending. Therefore to these powers it is said by the angels, who are the couriers of the Saviour and Lord: <!–
–>Lift up your gates, you princes; and be lifted up, you everlasting doors: and the King of glory shall come in. (On Psalm 23)
Eusebius of Caesarea ca. 263-339
The Virtues of Heaven, seeing Him begin to rise, surrounded Him to form His escort, proclaiming His Ascension as they cried, “Rise up, gates everlasting and the King of Glory will enter.” These things were accomplished in what the book of Acts record for us: ‘And when He had said these things He was lifted up before their eyes.’” (Comm. In Ps. 17)
It was fitting that the angels who had served Him during His life on earth should precede the Son of God in His Ascension into Heaven, fling wide the gates of Heaven and breaking forth into the angelic words that the psalmist calls jubilation and sound of triumph: ‘God is ascended with jubilee, and the Lord with the sound of trumpet.’” (Comm. In Ps. 23)
St. Athanasius the Great ca. 297-373
The angels of the Lord who followed Him upon earth, seeing Him arise, announced His coming to the Virtues of Heaven, so that they might open their gates. The Powers were filled with amazement at seeing Him in the flesh. That is why they cried, ‘Who is this?’ – astounded by this mysterious order of salvation. And the angels rising with Christ answered them, ‘The Lord of Powers, He is the King of Glory who teaches the great mystery to those who are in heaven: that the King of Glory has won victory of the spiritual enemy.’ (Exp. In Ps. 23)
St. Cyril of Jerusalem ca. 313-386
The Mount of Olives bears witness, that holy mount from which He ascended to the Father: the rain-bearing clouds are His witnesses, having received their Lord: yea, and the gates of heaven bear witness [having received their Lord ], concerning which the Psalmist said, Lift up your doors, O you Princes, and be lifted up you everlasting doors; and the King of Glory shall come in. (Catechetical Lectures 10.19)
St. Gregory the Theologian ca. 329-389
And if He ascend up into Heaven, Lk. 24:51 ascend with Him. Be one of those angels who escort Him, or one of those who receive Him. Bid the gates be lifted up, or be made higher, that they may receive Him, exalted after His Passion. Answer to those who are in doubt because He bears up with Him His body and the tokens of His Passion, which He had not when He came down, and who therefore inquire,
Who is this King of Glory? that it is the Lord strong and mighty, as in all things that He has done from time to time and does, so now in His battle and triumph for the sake of Mankind. And give to the doubting of the question the twofold answer. And if they marvel and say as in Isaiah’s drama Who is this that comes from Edom and from the things of earth? Or How are the garments red of Him that is without blood or body, as of one that treads in the full wine-press? Isa. 63:1 set forth the beauty of the array of the Body that suffered, adorned by the Passion, and made splendid by the Godhead, than which nothing can be more lovely or more beautiful. (Oration 45.25)
St. Ambrose of Milan ca. 339-397
The angels, too, were in doubt when Christ arose; the powers of heaven were in doubt when they saw that flesh was ascending into heaven. Then they said:
Who is this King of glory? And while some said
Lift up your gates, O princes, and be lifted up, you everlasting doors, and the King of glory shall come in. In Isaiah, too, we find that the powers of heaven doubted and said:
Who is this that comes up from Edom, the redness of His garments is from Bosor, He who is glorious in white apparel? Isa. 63:1 (On the Mysteries 7.36)
Blessed Augustine of Hippo ca. 354-430
Take away your gates, you princes Psalm 23:7. All you, that seek rule among men, remove, that they hinder not, the entrances which you have made, of desire and fear.
And be lifted up, you everlasting gates. And be lifted up, you entrances of eternal life, of renunciation of the world, and conversion to God.
And the King of glory shall come in. And the King, in whom we may glory without pride, shall come in: who having overcome the gates of death, and having opened for Himself the heavenly places, fulfilled that which He said,
Be of good cheer, for I have overcome the world. Jn. 16:33
Who is this King of glory? Mortal nature is awe-struck in wonder, and asks,
Who is this King of glory?
The Lord strong and mighty. He whom you deemed weak and overwhelmed.
The Lord mighty in battle Ps. 23:8. Handle the scars, and you will find them made whole, and human weakness restored to immortality. The glorifying of the Lord, which was owing to earth, where It warred with death, has been paid.
Take away your gates, you princes. Let us go hence straightway into heaven. Again, let the Prophet’s trumpet cry aloud,
Take away too, you princes of the air, the gates, which you have in the minds of men who ‘worship the host of heaven.’ 2 Kgs. 17:16
And be lifted up, you everlasting gates. And be lifted up, you doors of everlasting righteousness, of love, and chastity, through which the soul loves the One True God, and goes not a-whoring with the many that are called gods.
And the King of glory shall come in Ps. 23:9.
And the King of glory shall come in, that He may at the right hand of the Father intercede for us.
Who is this King of glory? What! Do you too, prince of the power of this air, Eph. 2:2 marvel and ask,
Who is this King of glory?
The Lord of powers, He is the King of glory Ps. 23:10. Yea, His Body now quickened, He who was tempted marches above you; He who was tempted by the angel, the deceiver, goes above all angels. Let none of you put himself before us and stop our way, that he may be worshipped as a god by us: neither principality, nor angel, nor power, separates us from the love of Christ. Rom. 8:39 It is good to trust in the Lord, rather than to trust in a prince; that he who glories, should glory in the Lord. 1 Cor. 1:31 These indeed are powers in the administration of this world, but
the Lord of powers, He is the King of glory.
(Exposition on Psalm 24)
St. Cyril of Alexandriaca. 376-444
[T]he Psalmist, though he speaks mysteries by the Spirit, says, Clap your hands, all ye people: then he explained the occasion of the festival, and introduced the Ascension of the Saviour into heaven, saying, God is gone up with a shout, the Lord with the sound of a trump: meaning by the shout and the trump the piercing and clear voice of the Spirit, when He bade the powers above open the gates, and named Him Lord of Hosts, as we said just now. On the same occasion moreover, we shall find the choir of the Saints rejoicing with great joy of heart. Then too he said in one place, The Lord reigneth, let the earth rejoice; and in another, The Lord reigneth: the Lord hath put on glorious apparel, the Lord hath put on and girded Himself with might. For He that was with us as a man before His resurrection from the dead, when He ascended to His Father in the heavens, then put on His own glorious apparel, and girded Himself with the might that was His from the beginning, for He sat and reigneth with the Father. (Commentary on the Gospel of John Bk. 10, Chap. 1)