God is just. So he does not leave sins to go unpunished. God prefers to bless his people. Therefore, he looks for ways to avoid applying his punishment. Here he shakes the sinners to wake up! The signal of an approaching enemy army is heard. The whole country is startled!
1 Blow a trumpet in Zion; sound an alarm on my holy mountain! Let all the inhabitants of the land tremble, for the day of the LORD is coming; it is near,