For they call themselves of the holy city - Of Jerusalem (see Isaiah 52:1; Nehemiah 11:1; Matthew 4:5; Matthew 27:53; Isaiah 1:9). The object of the prophet in here mentioning his holy name is, probably, to show them the guilt of their conduct. He was Yahweh, the source of all existence. He was the God of all the hosts of heaven, and all the armies on earth. How wicked, therefore, it was to come before him in a false and hypocritical manner, and while they were professedly worshipping him, to be really offering their hearts to idols, and to be characteristically inclined to relapse into idolatry!