Augustine of Hippo

"There shall go a fire before Him, and burn up His enemies on every side" [Psalm 97:3]. We remember having read in the Gospel, He shall say, "Depart into everlasting fire, prepared for the devil and his angels." [Matthew 25:41] I do not think it is said of that fire. Why do I not? Because he speaketh of some fire, which shall go before Him, before He cometh to judgment. For it is said, that the fire goeth before Him, and burneth up His enemies on every side, that is, throughout the whole world. …

Exposition on Psalm 97 ↗

Jerome

A fire shall go before him. Let him who is holy not fear this fire; let him who is a sinner fear it. This fire purges the holy, consumes sinners. A fire shall go before him. "Who makes his angels spirits, and his ministers a burning fire." I think these are the fires, that is, his angels. These angels, therefore, that is his fire, shall go before him. These angels — whom do they consume? Whoever is wood, hay, stubble. But he who is gold, silver, and precious stones shall indeed be cast into the fire, but shall be found the cleaner.

Homily 24, on Psalm 96 ↗

Bonaventure

Fire will precede the face of the Judge, by which the face of the earth will be burned up, so that the figure of this world will perish by the conflagration of worldly fires, just as the flood came about by the inundation of waters. Since in the final judgment, on account of the severity of the judge to be displayed, it is necessary that the hearts of all be terrified, and especially of sinners, who despised the Lord of all things, so that every creature may receive divine zeal and be conformed to its Author, and also conformed to …

Breviloquium, Part 7 ↗