Joel 2:10

Earth shall quake. This verse should be understood in connection with v. 11. It describes the physical phenomena accompanying the day of the Lord. The conditions here portrayed could not have been produced by the locust army unless the language was intended to be highly hyperbolic. The vivid description of the insect invasion served only as an illustration of the judgments to come upon Judah in the day of the Lord (see on ch. 1:4,15).

The sun and the moon. Compare Isa. 13:9-11; Amos 8:9. Jesus showed how these physical phenomena would be displayed in connection with the final day of the Lord (Matt. 24:29, 30). Joel was focusing on the great day of the Lord as it might have been fulfilled with respect to the nation of Israel (see on Joel 1:4). Jesus was showing how the great day of the Lord will come, now that the purpose of God are being accomplished through the church (see pp. 35, 36).