Within and without mean inside and outside, and the bite is the sting.
Hitty Pitty within the wall, Hitty Pitty without the wall. If you touch Hitty Pitty, Hitty Pitty will bite you. What is it?
Give me a hintThe hint
It grows on both sides of the garden wall.
Reveal the answerHide the answer
A nettle
Source: J. O. Halliwell, Popular Rhymes and Nursery Tales, 1849