PETER: You mustn’t touch me.
WENDY: Why?
PETER: No one must ever touch me.
WENDY: Why?
PETER: I don’t know.
(He is never touched by any one in the play.)J. M. Barrie (1860-1937) Scottish novelist and dramatist [James Matthew Barrie]
Peter Pan, Act 1 (1904, pub. 1928)
(Source)
These lines are not in Barrie's novelization, Peter and Wendy (1911).