Jerome — as excerpted in the Catena Aurea on Matthew 25:1-13

“The Jews have a tradition that Christ will come at midnight, in like manner as in that visitation of Egypt, when the Paschal feast is celebrated, and the destroyer comes, and the Lord passes over our dwellings, and the door posts of each man’s countenance are hallowed by the blood of the Lamb. Hence, I suppose, has continued among us that apostolic tradition, that on the vigil of Easterc the people should not be dismissed before midnight, in expectation of Christ’s coming; but when that hour has past over, they may celebrate the feast in security; whence also the Psalmist says, At midnight did I rise to praise thee. (Ps. 119:62.)”