'Shadow' in the Bible

As a servant desireth the shadow, And as a hireling expecteth his wage,

(For of yesterday we are, and we know not, For a shadow are our days on earth.)

As a flower he hath gone forth, and is cut off, And he fleeth as a shadow and standeth not.

And dim from sorrow is mine eye, And my members as a shadow all of them.

Cover him do shades, with their shadow, Cover him do willows of the brook.