Jamieson, Fausset and Brown on Zephaniah 2:3

3. As in Zep 2:1 (compare Note, see on Zep 1:12) he had warned the hardened among the people to humble themselves, so now he admonishes "the meek" to proceed in their right course, that so they may escape the general calamity (Psa 76:9). The meek bow themselves under God's chastisements to God's will, whereas the ungodly become only the more hardened by them.

Seek ye the Lord--in contrast to those that "sought not the Lord" (Zep 1:6). The meek are not to regard what the multitudes do, but seek God at once.

his judgment--that is, law. The true way of "seeking the Lord" is to "work judgment," not merely to be zealous about outward ordinances.

seek meekness--not perversely murmuring against God's dealings, but patiently submitting to them, and composedly waiting for deliverance.

it may be ye shall be hid--(Is 26:20; Am 5:6). This phrase does not imply doubt of the deliverance of the godly, but expresses the difficulty of it, as well that the ungodly may see the certainty of their doom, as also that the faithful may value the more the grace of God in their case (1Pe 4:17-19) [Calvin]. Compare 2Ki 25:12.