In Eze_21:19,20 you had the mention of Rabbath, chief city of the Ammonites, in equal danger with Jerusalem; but while Jerusalem is threatened, Rabbath is no further minded, till now God directs the prophet to declare the ruin thereof.
The Ammonites; a stout, but proud, injurious, and insulting people.
Their reproach, wherewith they reproached Israel in the day of Israel’s afflictions, as Jer_49:1, and Eze_25:3,5,6, and blasphemed the God of Israel.
The sword; all warlike preparations are made against you.
The sword is drawn; the war is declared, and your enemy hath drawn the sword: see Eze_21:9-11.
For the slaughter; to make waste, by avenging former quarrels and affronts. The Babylonish king comes out with bloody mind against you, O Ammonites! You countenanced Ishmael, who slew Gedaliah, viceroy by Nebuchadnezzar’s appointment, and you would have set Ishmael on the throne; this affront you shall satisfy for with your blood.