The people of Israel looked forward to "the day of Yahweh" as a day that Yahweh would judge the nations around them. But Joel warns that Yahweh would also judge Israel for being unfaithful to him. After judging them, Yahweh will restore his people.
Joel's message applies to the people of God in the church age. For Yahweh says, "I will pour out my Spirit on all flesh" and "everyone who calls on Yahweh will be saved" (2:28 and 2:32, quoted by Peter in Acts 2:17 and 2:21).
The traditional title of this book is "The Book of Joel" or just "Joel." Translators may also call it the "The Book about Joel" or "The Sayings of Joel." (See: [[rc://en/ta/man/translate/translate-names]])
Farmers in the ancient Near East sometimes experienced locust attacks. Millions of these insects would come and eat all the crops in their fields. In Chapters 1 and 2, Joel described such attacks using military terms. He may have been prophesying about enemy invaders who would come and destroy the land and its people.
Joel also described a drought in Chapter 2. It might have been a real lack of rain. Or Joel may have been prophesying about either enemy invaders or Yahweh himself coming to punish his people and the other nations.
Joel prophesied that God will defeat Israel's enemies, rebuild the city of Jerusalem, and rule as victorious king over the whole world. At the same time, God will give his Spirit to all his people, and they will receive messages from him in dreams and visions. (See: [[rc://en/tw/dict/bible/kt/holyspirit]])
All of the text in the Book of Joel is poetry. The ULB presents it in this way. The UDB, however, presents the text as prose. Translators may choose to use prose in their versions. Translators who want to translate the book as poetry should read about poetry and parallelism. (See: [[rc://en/ta/man/translate/writing-poetry]] and [[rc://en/ta/man/translate/figs-parallelism]])