A fire goeth before him - See Psalm 18:13, note; Psalm 50:3, note.
And burneth up his enemies round about - Is especially directed against his foes. That is, he manifests himself as a just God, inflicting vengeance on his enemies. He comes to reign, and in his reign all his foes will be destroyed.

A fire goeth before him - Literally, this and the following verse may refer to the electric fluid, or to manifestations of the Divine displeasure, in which, by means of ethereal fire, God consumed his enemies. But fire is generally represented as an accompaniment of the appearances of the Supreme Being. He appeared on Mount Sinai in the midst of fire, thunder, and lightninys, Exodus 19:16-18. Daniel, Daniel 7:9, Daniel 7:10, represents the Sovereign Judge as being on a throne which was a fiery flame, and the wheels of his chariot like burning fire; and a fiery streamer issuing from it, and coming forth from before him. St. Paul tells us (2-Thessalonians 1:8) that the Lord Jesus shall be revealed from heaven with his mighty angels, in faming fire; and St. Peter, (2-Peter 3:7, 2-Peter 3:10, 2-Peter 3:11), that when the Lord shall come to judgment the heavens and the earth shall be destroyed by fire. the heavens shall pass away with a great noise, the elements melt with fervent heat, and the earth and its works be burnt up. Here then, will appear: -
"Our God in grandeur, and our world on fire."
Burneth up his enemies round about - The fire is his pioneer which destroys all the hinderances in his way, and makes him a plain passage.

A fire goeth before him, 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.

The attending illustrations of God's awful justice on enemies (Psalm 83:14) are seen in the disclosures of His almighty power on the elements of nature (compare Psalm 46:2; Psalm 77:17; Habakkuk 3:6, &c.).