Jamieson, Fausset and Brown on Zephaniah 3:11

11. shalt thou not be ashamed--Thou shalt then have no cause to be ashamed; for I will then take away out of the midst of thee those who by their sins gave thee cause for shame (Zep 3:7).

them that rejoice in thy pride--those priding themselves on that which thou boastest of, thy temple ("My holy mountain"), thy election as God's people, &c., in the Pharisaic spirit (Jr 7:4; Mi 3:11; Mt 3:9). Compare Jr 13:17, "mine eyes shall weep for your pride." The converted remnant shall be of a humble spirit (Zep 3:12; Is 66:2, 10).