Oecumenius

Could it be that some of the Fathers accepted the concept of restoration [ἀποκατάστασιν] from this point onward, saying that sinners are punished only up to this time, but thereafter no longer, as if they have been purified by the punishment? But what should be done regarding the many others among the Fathers, and the approved Scriptures, which speak of the punishments of those who were then being punished as eternal? What then might one say, or how should one regulate the parts? One must blend the opinions of both sides. …

Commentary on Revelation ↗

Bede

And it was said to them that they should not kill them, etc. Although heretics, empowered by secular authority, are allowed to attack the good temporally, they cannot kill the soul, as the Lord says. For the time of the world is signified by five months, because of the five-part sense which we use in this life. That another translation contains six months agrees with the same sense because of the six ages of the world.

Commentary on Revelation ↗

Alcuin of York

And it was given unto them that they should not kill them; but that they should torment them five months yet. If those who do not have the sign are reprobates, how can the locusts be forbidden from killing them? And can it be that those who do not have the sign of God are alive? Therefore it is implied that this refers to the previous sentence. …

Commentary On Revelation ↗