Zephaniah 1:6 Those who have turned back from following the Lord, and have not sought the Lord, nor inquired of Him.”
Zephaniah already addressed the idolatrous priests, or those once seemingly faithful in His flock who went after idols in verse 4. There are the double minded who swear oaths to both Yahweh and Milcom in verse 5. And now God addresses unfaithful Judah who has turned back from following Him as their spiritual head.