'Dark' in the Bible

And it came to pass about the time of shutting of the gate, when it was dark, that the men went out: whither the men went I wot not: pursue after them quickly; for ye shall overtake them.

Your fathers cried out for help to the Lord; he made the area between you and the Egyptians dark, and then drowned them in the sea. You witnessed with your very own eyes what I did in Egypt. You lived in the wilderness for a long time.