The wolf accused the fox of having cheated him. The fox, in turn, accused the wolf of having robbed him.
They took their dispute to court and it fell to the monkey to judge the issue.
Unfortunately, the whole case was so full of contradictions that no-one could make head or tail of it. Finally the monkey lost his patience.
'The wolf is guilty because he falsely accused the fox,' he decided and the fox is guilty because we all know he is a thief by nature. And since the right place for both liars and robbers is prison. It is prison that I will send them both!'