Matthew Poole and continuators on Isaiah 48:2

2. For they shall call themselves of the Holy City , and stay themselves upon the God of Israel, the LORD of Hosts is his Name .

Or, as others render it, and this particle frequently signifies, Though. And so this is added as a great aggravation of their want, and neglect of Truth and Righteousness.

They glory in this, that they are Citizens of Ierusalem, a City sanctified by God himself to be the onely place of his true worship, and gracious presence; which as it is a great priviledge, so it laid a great obligation upon them, to walk more holily than they did.

Not by a true and well-grounded Faith, but by a vain and presumptuous confidence, flattering themselves, as that people commonly did, that they should enjoy peace and safety, notwithstanding all their wickedness; because they were the Lords people, and had his Temple and Ordinances among them; which disposition the Prophets frequently observe, and sharply censure in them.

Or, Whose name is the Lord of Hosts.