Not ruby slippers, but Silver Shoes. An excerpt from "The Wonderful Wizard of Oz," by L. Frank Baum:
"The Silver Shoes," said the Good Witch, "have wonderful powers.
And one of the most curious things about them is that they can carry
you to any place in the world in three steps, and each step will be
made in the wink of an eye. All you have to do is to knock the heels
together three times and command the shoes to carry you wherever you
wish to go."
"If that is so," said the child joyfully, "I will ask them to
carry me back to Kansas at once."
She threw her arms around the Lion's neck and kissed him,
patting his big head tenderly. Then she kissed the Tin Woodman,
who was weeping in a way most dangerous to his joints. But she
hugged the soft, stuffed body of the Scarecrow in her arms instead
of kissing his painted face, and found she was crying herself at
this sorrowful parting from her loving comrades.
Glinda the Good stepped down from her ruby throne to give the
little girl a good-bye kiss, and Dorothy thanked her for all the
kindness she had shown to her friends and herself.
Dorothy now took Toto up solemnly in her arms, and having said
one last good-bye she clapped the heels of her shoes together three
"Take me home to Aunt Em!"
Instantly she was whirling through the air, so swiftly that
all she could see or feel was the wind whistling past her ears.
The Silver Shoes took but three steps, and then she stopped so
suddenly that she rolled over upon the grass several times before
she knew where she was.
At length, however, she sat up and looked about her.