Charles Ellicott Commentary Joel 3:16

"And Jehovah will roar from Zion, and utter his voice from Jerusalem; and the heavens and the earth shall shake: but Jehovah will be a refuge unto his people, and a stronghold to the children of Israel." — Joel 3:16 (ASV)

The Lord also shall roar ... —This is the key-note of the prophecy of Amos, who opens his appeal with these words. The majestic roar of the lion is transferred to express victorious utterance of the Lord’s judgment: it is irresistible. As St. Paul wrote, The Lord Himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God (1 Thessalonians 2:16). The temporal success of the Jews in their future conflict with their enemies is blended with the final triumph of the Lord in the judgment day.