John Chrysostom

"And about midnight there was a cry made." Either He was continuing the parable, or again He shows that the resurrection will be at night. But the cry Paul also indicates, saying, "With a shout, with a voice of an archangel, with the last trump, He shall come down from Heaven." And what mean the trumpets, and what saith the cry? "The bridegroom cometh."

Homily on the Gospel of Matthew 78 ↗

Theophylact of Ohrid

He says that a cry was made in the middle of the night to show that the Lord comes when least expected, as at midnight when we all have fallen into a deep sleep. He also comes with a cry, for a trumpet will sound at the second coming.

Commentary on Matthew ↗

Augustine of Hippo

Or, At midnight, that is, when none knew or looked for it.

Catena Aurea by Aquinas ↗

Jerome

But at midnight there was a cry, 'Look, the bridegroom is coming! Come out to meet him.' For suddenly, like in the darkest night and with calmness all around, when the heaviest sleep is upon everyone, the arrival of Christ will resound through the loud cry of angels and the trumpets of preceding powers. Let us say something that might be useful to the reader. …

Commentary on Matthew ↗

Gregory the Dialogist

"And at midnight a cry was made: Behold, the bridegroom comes, go out to meet him." The cry concerning the arrival of the bridegroom happens at midnight, because the day of judgment creeps up in such a way that it cannot be foreseen when it comes. Hence it is written: "The day of the Lord will come like a thief in the night."

Forty Gospel Homilies, Homily 12 ↗