כִּֽי־מִקּ֥וֹל יְהוָ֖ה יֵחַ֣ת אַשּׁ֑וּר בַּשֵּׁ֖בֶט יַכֶּֽה׃
For through the voice of the LORD shall Asshur be dismayed, The rod with which He smote.
Rashi on Isaiah
from the Lord’s voice Assyria shall be broken he opened up their ears, and they heard the song from the mouth of the Chayoth, and they died. In the Aggadah of Chapter Chelek.
Ibn Ezra on Isaiah
בשבט יכה As if he were smitten with a rod or for the Lord will smite him with a rod.51A. V., Which smote with a rod.
Rashi on Isaiah
with a rod he would smite Assyria, who was wont to smite you with his rod.