Phaedrus Phaedrus 
The Fables of Phædrus 

Driven by thirst, a Wolf and a Lamb had come to the same stream; the Wolf stood above, and the Lamb at a distance below. Then, the spoiler, prompted by a ravenous maw, alleged a pretext for a quarrel. ‚Why, ‚ said he, ‚have you made the water muddy for me while I am drinking?‘ The Fleece-bearer, trembling, answered: ‚Prithee, Wolf, how can I do what you complain of? The water is flowing downwards from you to where I am drinking.‘ The other, disconcerted by the force of truth, exclaimed: ‚Six months ago, you slandered me.‘ ‚Indeed, ‚ answered the Lamb, ‚I was not born then.‘ ‚By Hercules, ‚ said the Wolf, ‚then ‚twas your father slandered me;‘ and so, snatching him up, he tore him to pieces, killing him unjustly.
This Fable is applicable to those men who, under false pretences, oppress the innocent.