'Darkness' in the Bible

The sun shall be turned into darkness and the moon into blood, to usher in the day of the Lord-- that great and illustrious day;

The Lord's hand is now upon you, and you will be blind for a time and unable to see the light of day." Instantly there fell upon him a mist and a darkness, and, as he walked about, he begged people to lead him by the hand.

that they may turn from darkness to light and from the obedience to Satan to God, in order to receive forgiveness of sins and an inheritance among those who are sanctified through faith in Me.'