Psalm 23:
1 The Lord
is my shepherd; I shall not want.
2
He maketh me to lie down in green pastures: he leadeth me beside the still waters.
3 He restoreth my soul: he leadeth me in the paths of righteousness
for his name's sake.
4 Yea,
though I walk through the valley of the shadow of death, I will fear no evil: for thou art with me; thy rod and thy staff
they comfort me.
5 Thou
preparest a table before me in the presence of mine enemies: thou anointest my head with oil; my cup runneth over.
6 Surely goodness and mercy shall follow me all the days
of my life: and I will dwell in the house of the Lord for
ever.
See also my article on Psalm 23 -- The Great Shepherd Restores Our Souls.