Bede, on Rev 14:4

“These are they who were not defiled with women: for they are virgins. These follow the Lamb whithersoever he goeth. These were purchased from among men, the firstfruits to God and to the Lamb:”

“These were purchased from among all as first fruits to God and the Lamb. From that holy and immaculate flock of the Church, as holier and purer sacrifices for the merits of their will, they are chosen by the Holy Spirit: what the Apostle says about them, not having a command from the Lord (1 Cor. 7), he beseeches them to present their bodies as a living sacrifice, holy, and pleasing to God (Rom. 12).”

Imported from an open dataset — not yet checked against the printed edition.