'Darkness' in the Bible

You approached and stood at the foot of the mountain, and the mountain burned with fire to the [very] heart of the heavens: darkness, cloud and thick gloom.

“The Lord spoke these words with a great voice to all your assembly at the mountain out of the midst of the fire, the cloud, and the thick darkness, and He added no more. He wrote these commandments on two tablets of stone and gave them to me.

And when you heard the voice from the midst of the darkness, while the mountain was burning with fire, you approached me, all the leaders (heads) of your tribes and your elders;

and you will be groping at noon [in broad daylight], just as the blind grope in the darkness, and nothing you do will prosper; but you will only be oppressed and exploited and robbed continually, with no one to save you.