Isaiah 40
28 Ref Have you not known? have you not heard? The everlasting God, Yahweh, the Creator of the ends of the earth, doesn't faint, neither is weary; there is no searching of his understanding.
29 Ref He gives power to the faint; and to him who has no might he increases strength.
30 Ref Even the youths shall faint and be weary, and the young men shall utterly fall: