'Dark' in the Bible

He said to me, "Do you see, son of man, what the elders of the house of Israel are doing in the dark, each in the chamber of his idolatrous images? For they think, 'The Lord does not see us! The Lord has abandoned the land!'"

While they are watching, raise your baggage onto your shoulder and carry it out in the dark. You must cover your face so that you cannot see the ground because I have made you an object lesson to the house of Israel."

In Tahpanhes the day will be dark when I break the yoke of Egypt there. Her confident pride will cease within her; a cloud will cover her, and her daughters will go into captivity.

As a shepherd seeks out his flock when he is among his scattered sheep, so I will seek out my flock. I will rescue them from all the places where they have been scattered on a cloudy, dark day.