Sometimes denotes intense darkness and gloom, Psalms 23:4, and sometimes a cool retreat, Isaiah 33:2, or perfect protection, Psalms 17:8 Isaiah 49:2 Daniel 4:12.
The long shadows cast by the declining sun are alluded to in Job 7:2 Jeremiah 6:4. The swift, never ceasing motion of a shadow is an emblem of human life, 1 Chronicles 29:15 Psalms 102:11.
These dictionary topics are from American Tract Society Bible Dictionary published in 1859. Public Domain, copy freely.
Rand, W. W. "Entry for 'SHADOW'". "American Tract Society Bible Dictionary".