'Darkness' in the Bible

O generation, mark ye the word of Jehovah. Have I been a wilderness unto Israel, or a land of thick darkness? Wherefore say my people, We have dominion; we will come no more unto thee?

Give glory to Jehovah your God, before he cause darkness, and before your feet stumble upon the mountains of twilight; and ye shall look for light, but he will turn it into the shadow of death, and make it gross darkness.

Therefore their way shall be unto them as slippery places in the darkness; they shall be driven on, and fall therein: for I will bring evil upon them in the year of their visitation, saith Jehovah.