Out of the dark clouds of fear and siege emerges a profound moment of relief and liberation. After enduring a long period of constant anxiety under the shadow of the Assyrian empire, the people of Judah suddenly see a figure on the horizon. A messenger arrives on the mountain peaks, carrying the long-awaited news of the enemy's downfall and signaling an end to the immediate danger of war [מצודת דוד, ביאור שטיינזלץ]. This announcement opens the door for the nation to return to a life of joy, regular worship of God, and daily routine.
The appearance of this messenger upon the mountains is seen by some as a subtle reminder of the spiritual merits that brought about this miraculous rescue. These mountain peaks represent the enduring merit of the Patriarchs, the merit of Mount Sinai reflecting King Hezekiah's dedication to Torah study, and the merit of Mount Moriah representing the sacred service in the Temple [חומת אנך].
However, the message delivered is specifically one of peace rather than ultimate salvation. The good news is limited to a temporary pause in conflict rather than a complete and absolute rescue. This distinction is crucial, as the relief from the Assyrian threat was only temporary; shortly after this period of peace, the Babylonian kingdom would rise and march against Judah [אברבנאל].
With the immediate threat removed and the Assyrian king Sennacherib dead, a call goes out to the people to celebrate and fulfill their promises. The primary approach among commentators is that the survivors are now free to leave their fortified cities. They can finally travel up to Jerusalem to offer sacrifices and celebrate their festivals with genuine joy. Alongside this celebration, they are instructed to make good on the vows they made to God during their time of deep distress, when they promised to offer sacrifices if He would save them from the Assyrian king [אבן עזרא, רד״ק, מצודת דוד, אברבנאל, רש״י]. This call to fulfill vows also mirrors a specific historical moment when King Manasseh of Judah was taken captive by Assyria. After praying to God and being restored to his throne, he rebuilt the altar and faithfully paid his vows [מלבי״ם].
The profound joy of this moment stems from the absolute removal of the threat. The oppressor is understood to be a thoroughly wicked and irredeemable person [ביאור שטיינזלץ], universally identified by commentators as Sennacherib. The divine promise guarantees that this wicked king, along with his entire family and lineage, has been completely wiped out from the world. His sons, who fled the region, will never return to wage war in the Land of Israel, ensuring that no remnant of his destructive legacy remains to threaten the people again.