הָעָם֙ הַהֹלְכִ֣ים בַּחֹ֔שֶׁךְ רָא֖וּ א֣וֹר גָּד֑וֹל יֹשְׁבֵי֙ בְּאֶ֣רֶץ צַלְמָ֔וֶת א֖וֹר נָגַ֥הּ עֲלֵיהֶֽם׃
דאָס פֿאָלק װאָס איז געגאַנגען אין פֿינצטערניש, האָט דערזען אַ גרױס ליכטיקײט; די װאָס זײַנען געזעסן אין לאַנד פֿון טױטשאָטן, אױף זײ האָט אַ ליכטיקײט געשײַנט.
Rashi
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
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.