They call themselves of the holy city... — The words of praise are spoken, as the preceding words show, with a touch of irony. Those who so boasted were not true citizens of Zion (Psalms 15:1; Matthew 3:9). They did not enter into all that was implied in their confession of Jehovah Sabaoth.
Related Commentaries of Isaiah 48:2
Isaiah 48:2
2 For they call themselves of the holy city, and stay themselves upon the God of Israel; The LORD of hosts is his name.