Augustine of Hippo, on 2Pet 2:4

“For if God spared not the angels that sinned, but delivered them, drawn down by infernal ropes to the lower hell, unto torments, to be reserved unto judgment:”

“It is a fixed and unchanging religious truth that the devil and his angels are never to return to the life and holiness of the saints. From Scripture we know that God's sentence implies that he dragged them down by infernal ropes to Tartarus and delivered them to be tortured and kept in custody for judgment. They will be received into everlasting fire and there tortured forever and ever.”

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