Joel was a prophet (holy
man). The Book of Joel is in the Old Testament part of the Bible.
The Book of Joel describes
some terrible events. Joel called these events 'the Day of God'. A terrible
army would attack Jerusalem.
They would destroy everything. Nobody could escape from this army.
So, the people must confess
their evil deeds to God. Even when these terrible things happen, they must ask
God to save them (Joel 2:12-17).
Then, God will be kind to
his people. He will hear their prayers. He will cause this terrible army to
leave. He will provide food for his people. And he will send his Spirit on all
people (Joel 2:28-32).
God will also punish the
nations that attack Jerusalem
(Joel 3:1-16). But God will protect his own people always (Joel 3:17-21).