Never look back

"The descent to the Underworld of Orpheus is paralleled in other versions of a worldwide theme: the Japanese myth of Izanagi and Izanami, the Akkadian/Sumerian myth of Inanna's Descent to the Underworld, and Mayan myth of Ix Chel and Itzamna.

The Nez Perce tell a story about the trickster figure, Coyote, that shares many similarities with the story of Orpheus and Eurydice. The mytheme of not looking back, an essential precaution in Jason's raising of chthonic Brimo Hekate under Medea's guidance, is reflected in the Biblical story of Lot's wife when escaping from Sodom.

The warning of not looking back is also found in the Grimms' folk tale "Hansel and Gretel." More directly, the story of Orpheus is similar to the ancient Greek tales of Persephone captured by Hades and similar stories of Adonis captive in the underworld. However, the developed form of the Orpheus myth was entwined with the Orphic mystery cults and, later in Rome, with the development of Mithraism and the cult of Sol Invictus."

http://en.wikipedia.org/wiki/Orpheus