The Wizard of Oz by Lynam Frank Baum Chapter 11 Page 15

“I do not know,” said the Head; “but that is my answer, and until the Wicked Witch dies you will not see your uncle and aunt again. Remember that the Witch is Wicked--tremendously Wicked--and ought to be killed. Now go, and do not ask to see me again until you have done your task.”

Sorrowfully Dorothy left the Throne Room and went back where the Lion and the Scarecrow and the Tin Woodman were waiting to hear what Oz had said to her.

“There is no hope for me,” she said sadly, “for Oz will not send me home until I have killed the Wicked Witch of the West; and that I can never do.”

Her friends were sorry, but could do nothing to help her; so Dorothy went to her own room and lay down on the bed and cried herself to sleep.