Commentaries:
Jamieson, Fausset, and Brown
Blow the trumpet--to convene the people (Numbers 10:3). Compare Joel 1:14. The nation was guilty, and therefore there must be a national humiliation. Compare Hezekiah's proceedings before Sennacherib's invasion (2Ch. 30:1-27).
Other commentary entries containing this verse:
1 Kings 21:9
2 Chronicles 20:3-4
Joel 1:14
Joel 2:16
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