The ultimate destiny of the wicked is the same habitation created for Satan and his demons – a place in English we call “hell,” and a place Jesus and the New Testament writers describe variously as Gehenna, “outer darkness,” “eternal fire,” “eternal punishment,” “lake of fire,” and “the second death.”
While Sheol and Hades generally depict the temporary abode of the dead, Gehenna and its associated terms describe the place of everlasting future punishment for those whose names are not written in the book of life (Rev. 20:15).
The term Gehenna is derived from the Valley of Hinnom. Located southwest of Jerusalem, this steep, rocky valley is the scene of human sacrifices to pagan deities (2 Kings 23:10; 2 Chron. 28:3; 33:6) and is declared the “Valley of Slaughter” by Jeremiah (Jer. 7:31-34).
The picture of a place where fires are never quenched and worms never stop feasting on corpses became to the Jewish mind an appropriate representation of the ultimate fate of idol worshipers.