Through The Looking Glass by Lewis Carroll Chapter 1 Page 21

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She puzzled over this for some time, but at last a bright thought struck her. ‘Why, it’s a Looking-glass book, of course! And if I hold it up to a glass, the words will all go the right way again.’

This was the poem that Alice read.

JABBERWOCKY

‘Twas brillig, and the slithy toves

Did gyre and gimble in the wabe;

All mimsy were the borogoves,

And the mome raths outgrabe.

‘Beware the Jabberwock, my son!

The jaws that bite, the claws that catch!