Joel was the second of the minor prophets. Little is known about him other than the name of his father.
Joel used a recent drought and locust plague as an object lesson to warn of a future invasion of Israel in the Day of the Lord. If the nation would repent and return to the Lord, God would restore His relationship with her and bless her.
He announced a day when God would give the Spirit of the prophets to all his children. For the church, Joel is the prophet who announced Pentecost, as Peter said on that day (Acts 2:17).
I will pour out my Spirit on all people.
Your sons and daughters will prophesy,
your old men will dream dreams,
your young men will see visions.
Even on my servants, both men and women,
I will pour out my Spirit in those days.