And I will shew wonders in the heavens and in the earth, blood, and fire, and pillars of smoke. Wonders in the heavens and in the earth - This refers to those dreadful sights, dreadful portents, and destructive commotion, by which the Jewish polity was finally overthrown, and the Christian religion established in the Roman empire. See how our Lord applies this prophecy, Matthew 24:29 (note), and the parallel texts.
Related Commentaries of Joel 2:30
Joel 2:30
30 And I will shew wonders in the heavens and in the earth, blood, and fire, and pillars of smoke.