Here God sends a prophet to his people: Joel. This prophet has to tell them that something terrible is approaching from God’s side. A prophet is a gift of God’s love (see the introduction to the book of Joel regarding a prophet). He announces the day of the Lord.
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,