Perry's Index to the Aesopica
Fables exist in many versions; here is one version in English:
THE LIONESS AND THE WILD BOAR
A bull found a lion lying asleep and gored him with his horns until he was dead.
The lion's mother showed up and wept bitterly over her son. When the wild boar
saw the mother lion lamenting, he stood at a safe distance and said, 'Oh, how
many people are also weeping at this very moment because their sons have been
killed by you lions!'
This fable shows that what you have done to others will likewise be done
to you, according to the same measure.
Aesop's Fables. A new translation by Laura
Oxford University Press (World's Classics): Oxford, 2002.
cover, with new ISBN, published in 2008; contents of book unchanged.
Perry 414: Gibbs (Oxford) 376 [English]
Perry 414: Townsend 161 [English]
Perry 414: Syntipas 11 [Greek]
You can find a compilation of Perry's index to the Aesopica in the gigantic appendix to his
edition of Babrius and Phaedrus for the Loeb Classical Library
(Harvard University Press: Cambridge, 1965). This book is an absolute must for anyone interested
in the Aesopic fable tradition. Invaluable.