Isaiah 40:29 in the King James Version
He giveth power to the faint; and to them that have no might he increaseth strength.
Context
28 Haven’t you known? Haven’t you heard? The everlasting God, the LORD, the Creator of the ends of the earth, doesn’t faint. He isn’t weary. His understanding is unsearchable.
29 He gives power to the weak. He increases the strength of him who has no might.
30 Even the youths faint and get weary, and the young men utterly fall;