Sacrifice at the stone table

Aslan sacrifices himself to Jadis, a.k.a. the White Witch, so Edmund would not have to die for his treachury. But because the White Witch fully intended to go back on the deal, and because Aslan did nothing wrong, he came back to life. Aslan explained to Lucy and Susan, who witnessed Aslan's death and ressurection, that "When a willing victim who has commited no treachury, is killed in a traitor's stead, the Stone Table will crack, and even death itself will turn backwards."