From Fr. Jude Botelho:
The first reading from Zephaniah speaks of the Day of Yahweh, when God will intervene directly in the life of Israel. Zephaniah advises the people to seek God in humility and lowliness. These are necessary conditions to find God for he rejects falsehood and the proud-hearted, who believe that they can manage on their own and don’t need him. The Israelite nation had suffered decades of oppression under the Assyrian rule, the prophet now announces the arrival of salvation and liberation of the little ones who have suffered under foreign rule. This ‘Day of Yahweh’ is a time of effective action by God on behalf of his people. God is close to those who are humble and depend on him.