Zeph 1:12

1:12 I will search. There is no escape from the divine scrutiny (Ps. 139; Amos 9:1–4).

who are complacent. See text note. The prophet draws a word picture from the wine-making process. Like the sediment of wine, which settles and thickens if left undisturbed, the citizens of Jerusalem have become settled (confirmed) in their indifference toward God. Because they are thoroughly complacent toward God, they regard Him as morally indifferent toward good or evil.