Isaiah 40:28-31 (King James Version)
28
Hast thou not known? hast thou not heard, that
the everlasting God, the LORD, the Creator of
the ends of the earth, fainteth not, neither is
weary? there is no searching of his
understanding.
29 He giveth power to the faint; and to them that have no might he increaseth strength.
30 Even the youths shall faint and be weary, and the young men shall utterly fall:
31 But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint.