Traditionally called the "Prophet of Pentecost," since his prophecy of the outpouring of the Spirit (2:28ff.) is quoted by Peter (Acts 2:16) as being fulfilled at Pentecost, Joel was the kind of man who could see the eternal in the temporal. The occasion of his message was a devastating locust plague, which he interpreted as foreboding the Day of the Lord when God would act directly to punish His people for their sins. Joel calls upon the people of Judah to repent, promising that repentance will bring God’s blessings, material and spiritual.