Albert Barnes Commentary Zephaniah 3:3

"Her princes in the midst of her are roaring lions; her judges are evening wolves; they leave nothing till the morrow." — Zephaniah 3:3 (ASV)

The prophet, having declared the wickedness of the whole city, recounts how those in both Church and state—the ministers of God in each sphere—who should have corrected the evil, themselves aggravated it. It is not enemies from outside who destroy her, but Her princes within her - in the very midst of the flock, whom they should, in God’s place, “feed with a true heart,” destroy her as they please, having no protection against them. Her judges are evening wolves ; these, who should in the Name of God redress all grievances and wrongs, are themselves like wild beasts when most driven by famine. They gnaw not the bones until the morrow or on the morrow (literally, in the morning). They reserve nothing until the morning light but do the works of darkness in darkness, shrinking from the light, and, in extreme rapacity, devouring at once the whole substance of the poor.

As Isaiah says, Thy princes are rebellious and companions of thieves (Isaiah 1:23), and The Lord will enter into judgment with the ancients of His people and the princes thereof: for ye have eaten up the vineyard: the spoil of the poor is in your houses (Isaiah 3:14).

And Ezekiel states, Her princes in the midst thereof are like wolves, ravening the prey to shed blood, to destroy souls, to get dishonest gain (Ezekiel 22:27).