“ וַיִּקְרָא אֱלֹהִים לָאוֹר יוֹם, וְלַחֹשֶׁךְ קָרָא לָיְלָה”
“And God called the light Day, and the darkness He called Night. ”
The empty vessel, which is a female aspect without light is called darkness.
Zeir Anpin receives the Light of Chokmah from Binah and didn’t experience a state of darkness. Below Zer Anpin of the world of Atzilut, there’s a darkness and Klipa that is the aspect of (Genesis 1:2) “and darkness was upon the face of the deep”.
There’s an aspect of darkness that is (Job 10:22) “a land of the shadow of death” that is the aspect of ‘Hell’ that was created before the world were created.
When the Light of the Final Redemption appears in the world, the Israelites with the merit will enjoy the glory of God while the others will stay in darkness.
“קוּמִי אוֹרִי, כִּי בָא אוֹרֵךְ; וּכְבוֹד יְהוָה, עָלַיִךְ זָרָח”
“כִּי-הִנֵּה הַחֹשֶׁךְ יְכַסֶּה-אֶרֶץ, וַעֲרָפֶל לְאֻמִּים; וְעָלַיִךְ יִזְרַח יְהוָה, וּכְבוֹדוֹ עָלַיִךְ יֵרָאֶה”
“Arise, shine; for your light has come, And the glory of YHVH has risen upon you.”
“For behold, darkness will cover the earth And deep darkness the peoples; But YHVH will rise upon you And His glory will appear upon you.”