'Darkest' in the Bible

Even when I go through the darkest valley,I fear no danger,for You are with me;Your rod and Your staff—they comfort me.

You have put me in the lowest part of the Pit,in the darkest places, in the depths.

But the way of the wicked is like the darkest gloom;they don’t know what makes them stumble.

Give glory to the Lord your Godbefore He brings darkness,before your feet stumbleon the mountains at dusk.You wait for light,but He brings darkest gloomand makes thick darkness.