Joel 2:1 Commentary - The Cambridge Bible for Schools and Colleges
1. Blow ye the horn in Zion ] see, in justification of this rendering of shôphâr, on Amo 2:2. The horn is to be sounded, in order to give notice of impending danger, and arouse the people to meet it (cp. on Amo 3:6).
sound an alarm ] The word, though it often has the sense of shouting, is used also to denote the long, continuous blast of the horn, which, in contradistinction to a succession of short, sharp notes, was the signal of danger (Num 10:9, though the reference there is not to the shôphâr, but to the ḥatzôtzerâh).
tremble ] aroused viz., by the ‘alarm,’ from their security.
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The Cambridge Bible for Schools and Colleges
The Cambridge Bible for Schools and Colleges is a biblical commentary set published in parts by Cambridge University Press from 1882 onwards. Anglican bishop John Perowne was the general editor. The first section published was written by theologian Thomas Kelly Cheyne and covered the Book of Micah.
Perowne exercised limited editorial control over the writers of individual commentaries: his aim was "to leave each contributor to the unfettered exercise of his own judgment".