L. Frank Baum,
Dorothy and the Wizard in Oz — Chapter 5…
(1908)
“ As they sat upon the grass watching Jim, who was still busily eating, Eureka said:"I don't believe you are a Wizard at all!""No," answered the little man, "you are quite right. In the strict sense of the word I am not a Wizard, but only a humbug.""The Wizard of Oz has always been a humbug," agreed Dorothy. "I've known him for a long time.""If that is so," said the boy, "how could he do that wonderful trick with the nine tiny piglets?" ”
