Rashi on Isaiah
The people who walked in darkness The inhabitants of Jerusalem, who were darkened by their concern [of falling into the hands] of Sennacherib. Comp. with what Hezekiah said (infra 7:3), “This day is a day of distress, debate, and blasphemy.”
Ibn Ezra on Isaiah
The people that walk in darkness. The people of Jerusalem, who in their affliction walk in her streets as if they were blind of both their eyes.