Wolf in sheep's clothing moral story

Once upon a time there was a wolf lived in a deep forest. Certain the wolf could not get enough to eat because of the watchfulness of the shepherds. But one night he found a sheep skin that had been cast aside and forgotten. The next day, he dressed in that skin himself, the Wolf strolled into the pasture with the sheep. Soon a little Lamb was following him for eating a good patch of grass besides of his heard. It was quickly led away to slaughter.

That evening the wolf entered the fold with the flock. But that day the shepherd took a lamb for sell it. The Shepherd at last sell the the the lamb. That evening his fellow picking up a knife for kill and get the mutton. He went to the fold its skin and he killed the lamb. But he saw after removing the skin it was killed the wolf.

Moral: The evil doer often comes to harm through his own deceit.