'Blow the Trumpet' in the Bible

Blow the trumpet in Zion [warning of impending judgment],Sound an alarm on My holy mountain [Zion]!Let all the inhabitants of the land tremble and shudder in fear,For the [judgment] day of the Lord is coming;It is close at hand,

Blow a trumpet in Zion [warning of impending judgment],Dedicate a fast [as a day of restraint and humility], call a solemn assembly.