Zephaniah reveals that only the judgment of God can cleanse Judah of the sins that she has committed. The day of the Lord is coming and the nation must prepare for its salvation. According to the genealogy at the beginning of the book, Zephaniah was active during the reign of King Josiah.

Zephaniah 2

2:11 The LORD will be terrible unto them: for he will famish all the gods of the earth; and men shall worship him, every one from his place, even all the isles of the heathen.