Tuapiko and Tawhaitiri were two huge spirits dwelling in the underworld (Pō). The soul of the deceased had to pass between them: the light, free soul would proceed in safety, while the heavy, burdened soul was caught and destroyed.
- Tregear, Edward. (1891). Maori-Polynesian Comparative Dictionary. Wellington: Government Printer, p. 543.
- Wohlers, J. F. H. (1876). "Mythology and Tradition of the Maori." New Zealand Institute, Transactions 8:108-123, p. 111.