'Darkness' in the Bible

Generation, consider the word of Yahweh. Have I been a wilderness to Israel? Or a land of thick darkness? Why do my people say, 'We have broken loose. We will come to you no more?'

Give glory to Yahweh your God, before he causes darkness, and before your feet stumble on the dark mountains, and, while you look for light, he turns it into the shadow of death, and makes it gross darkness.

Therefore their way shall be to them as slippery places in the darkness: they shall be driven on, and fall therein; for I will bring evil on them, even the year of their visitation, says Yahweh.