'Darkness' in the Bible

“He guards the feet of His godly (faithful) ones,But the wicked ones are silenced and perish in darkness;For a man shall not prevail by might.

The next morning Saul put the men into three companies; and they entered the [Ammonites’] camp during the [darkness of the early] morning watch and killed the Ammonites until the heat of the day; and the survivors were scattered, and no two of them were left together.

David’s men said to him, “Behold, this is the day of which the Lord said to you, ‘Behold, I will hand over your enemy to you, and you shall do to him as seems good to you.’” Then David arose [in the darkness] and stealthily cut off the hem (edge) of Saul’s robe.