From that day forward the house of Israel will know that I am the LORD their God.
God speaks of this victory as already done, though the fulfillment lies ahead, because it is as certain as if accomplished. The routed army leaves behind such mountains of weapons that Israel will burn them for fuel seven years instead of cutting wood from the forests, turning the instruments of war into the ordinary means of warming their homes.
AI summary
Commenting on Ezekiel 39:8-22
This destruction of Israel's enemies will teach them who their God truly is: the One who chose them, redeemed them, kept His covenant with them, and defended them. After this, the Jews will never fall away again but will remain His people forever.
AI summary
So the house of Israel shall know . . . Lord--by My interposition for them. So, too, the heathen shall be led to fear the name of the Lord (Psa 102:15).