The Wizard of Oz by Lynam Frank Baum Chapter 5 Page 15

“I shall take the heart,” returned the Tin Woodman; “for brains do not make one happy, and happiness is the best thing in the world.”

Dorothy did not say anything, for she was puzzled to know which of her two friends was right, and she decided if she could only get back to Kansas and Aunt Em, it did not matter so much whether the Woodman had no brains and the Scarecrow no heart, or each got what he wanted.

What worried her most was that the bread was nearly gone, and another meal for herself and Toto would empty the basket. To be sure, neither the Woodman nor the Scarecrow ever ate anything, but she was not made of tin nor straw, and could not live unless she was fed.