Because of the birth of the single-sexed male Jackal, who was born without a soul, all humans eventually had to be turned into single-sexed beings. This was to prevent a being like the Jackal from ever being born on Earth again. "The Nummo foresaw that the original rule of twin births was bound to disappear, and that errors might result comparable to those of the jackal, whose birth was single. Because of his solitary state, the first son of God acted as he did." The removal of the second sex and soul from humans is what the ritual of circumcision represents in the Dogon religion. "The dual soul is a danger; a man should be male, and a woman female. Circumcision and excision are once again the remedy."