Chapter 21 mentions God’s Name fifteen times in different forms. This emphasis is meant to counter the popular perception – prevalent in pagan thought – that God would not destroy His own land, and to emphasize the events will come about by God’s will.

Jerusalem will not be saved; not only that but the city is about to suffer a large-scale massacre, and the sword that slaughters will do so in the agency of God.

The prophet addresses the sword of the king of Babylon.  The proximity of these two units highlights the idea that the sword of the king of Babylon is none other than the sword of God, in whose agency the king is acting.

Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion