John Gill's Exposition of the Whole Bible
Psalms 97:3
A fire goeth before him, c,] Not the fiery law, which went forth from his right hand on Mount Sinai but rather his Gospel, which, as it enlightens, warms, comforts, and refreshes his people, searches, torments, and destroys his enemies, and is the savour of death unto death to them; see Jeremiah 23:29. Some apply this to the gifts of the Spirit on the day of Pentecost, signified by cloven tongues of fire; but then no such effect followed as mentioned in the next clause: it seems best to interpret it of his wrath, which, like fire, was poured out to the uttermost on the Jews, for their disbelief and rejection of him; they would not have him to reign over them; they despised his Gospel, and slew his servants; wherefore he sent the Roman armies to them, who destroyed those murderers, and burnt their city,
Matthew 22:7, this will be also verified in the second coming of Christ, who will descend in flaming fire, and the earth will be burnt up, and all that is therein, 2 Thessalonians 1:7, some Jewish writers interpret this of the war of Gog and Magog, in Ezekiel, which they suppose still future; as, when it is, fire will be sent and rained upon them, Ezekiel 38:22, but may be better applied to the Gog and Magog in Revelation 20:8
and burneth up his enemies round about; so that none can escape: this was true of the Jewish nation, who were burnt up; so that there was not left root nor branch in it, Malachi 4:1, and will be true of the wicked, at the general conflagration of the world, upon Christ's second coming; and of the Gog and Magog army, after the resurrection.