Lift up your heads, O ye gates; even lift them up, ye everlasting doors; and the King of glory shall come in.

Wesley's Notes

24:9 Lift up - The same verse is repeated again, to awaken the dulness of mankind, who are so hardly brought to a serious preparation for such solemnities; and to signify the great importance of the matter, contained under these expressions.

Matthew Henry's Concise Commentary

24:7-10 The splendid entry here described, refers to the solemn bringing in of the ark into the tent David pitched for it, or the temple Solomon built for it. We may also apply it to the ascension of Christ into heaven, and the welcome given to him there. Our Redeemer found the gates of heaven shut, but having by his blood made atonement for sin, as one having authority, he demanded entrance. The angels were to worship him, Heb 1:6: they ask with wonder, Who is he? It is answered, that he is strong and mighty; mighty in battle to save his people, and to subdue his and their enemies. We may apply it to Christ's entrance into the souls of men by his word and Spirit, that they may be his temples. Behold, he stands at the door, and knocks, Rev 3:20. The gates and doors of the heart are to be opened to him, as possession is delivered to the rightful owner. We may apply it to his second coming with glorious power. Lord, open the everlasting door of our souls by thy grace, that we may now receive thee, and be wholly thine; and that, at length, we may be numbered with thy saints in glory.