'Black' in the Bible

“Now what are you doing by going to Egypt [in search of an ally],To drink the [muddy] waters of the Nile?Or what are you doing by going to Assyria [in search of an ally],To drink the [muddy] waters of the Euphrates?

“For this reason the earth shall mournAnd the heavens above shall become dark,Because I have spoken, I have decided,And I will not change my mind (relent), nor will I turn back from it.”

“Judah mournsAnd her gates languish;Her people sit on the ground in mourning clothesAnd the cry of Jerusalem has gone up.