'Dark' in the Bible

He will keep the feet of his holy ones, but the evil-doers will come to their end in the dark night, for by strength no man will overcome.

But one man of your family will not be cut off by my hand, and his eyes will be made dark, and grief will be in his heart: and all the offspring of your family will come to their end by the sword of men.

So he sent and brought him. He had a dark, healthy complexion, with beautiful eyes, and he was handsome. The LORD said, "Get up and anoint him, for this is the one."

When the Philistine looked and saw David, he had contempt for him, because he was only a young man. David had a dark, healthy complexion and was handsome.