The Lord opens the Chapter with a call upon his people: He graciously sets forth in what light they stood among the nations. In profession, they were indeed his people, and from the covenant relationship in which they stood to God, they denominated him as their Lord, and themselves as the holy city. But, in the midst of this high profession, and these distinguishing advantages, their hearts were not right with him, they had a name to live, but were virtually dead before God. Reader! think how prone, in all ages, the people of God have been to depart from him. Do you not, in the present hour, feel what Paul felt, and groan as he did? Romans 7:15, etc.
Related Commentaries of Isaiah 48:1
Isaiah 48:1-2
1 Hear ye this, O house of Jacob, which are called by the name of Israel, and are come forth out of the waters of Judah, which swear by the name of the LORD, and make mention of the God of Israel, but not in truth, nor in righteousness.
2 For they call themselves of the holy city, and stay themselves upon the God of Israel; The LORD of hosts is his name.