Charles Ellicott Commentary Isaiah 48:2

"(for they call themselves of the holy city, and stay themselves upon the God of Israel; Jehovah of hosts is his name):" — Isaiah 48:2 (ASV)

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.