has an analogue in a myth relating to the Colchian sorceress Medea.  To trick the Thessalian king's daughters into murdering their own father, the Medea tells them that they can make him young again by slaying him, cutting him into pieces, and placing these in a special cauldron.  To demonstrate that this will work, Medea takes an aged ram, chops it into bits, tosses them into the cauldron out of which a young ram shortly thereafter springs.  The king's daughters, who had been worrying about their aged father, chop him into bits so as to rejuvenate him too -- only Medea this time withholds some essential magic.