This fire, and lightning, and earthquake, and the sad effects of them, mentioned here, and Psalms 97:4,5, signify those dreadful judgments of God which should be inflicted upon the Jews and others for their refusal and contempt of the Messias; which was foretold in the Old Testament, and accomplished in the New Testament.
Related Commentaries of Psalms 97:3
Psalms 97:3
3 A fire goeth before him, and burneth up his enemies round about.