'Deep Darkness' in the Bible

“They did not say, ‘Where is the LordWho brought us up from the land of Egypt,Who led us through the wilderness,Through a land of deserts and of pits,Through a land of drought and of the deep darkness [of the shadow of death],Through a land that no man passed throughAnd where no man lived?’

“O generation [that you are], consider and regard carefully the word of the Lord.Have I been a wilderness to Israel [like a land without food],A land of thick and deep darkness [like a path without light]?Why do My people say, ‘We [have broken loose and we] are free to roam [at will];We will no longer come to You’?

Give glory to the LORD your God before he brings darkness, before your feet stumble on the mountains at twilight. You hope for light, but he turns it into deep darkness. He changes it into heavy gloom.