And they shall go forth, and look on the carcasses of the men that have transgressed against me: for their worm shall not die…
This verse is the basis of the later Jewish conception of Gehenna as the place of everlasting punishment (see Salmond's "Christian Doctrine of Immortality"). Gehenna is the Hebrew Ge-Hinnom (Valley of Hinnom), the place where, of old, human sacrifices were offered to Moloch, and for this reason desecrated by King Josiah (2 Kings 23:10). Afterwards it became a receptacle for filth and refuse, and Rabbinical tradition asserts that it was the custom to cast out unclean corpses there, to be burned or to undergo decomposition. This is, in all probability, the scene which had imprinted itself on the imagination of the writer, and which was afterwards projected into the unseen world as an image of endless retribution. The Talmudic theology locates the mouth of hell in the Valley of Hinnom.
(Prof. J. Skinner, D. D.)
Parallel VersesKJV: And they shall go forth, and look upon the carcases of the men that have transgressed against me: for their worm shall not die, neither shall their fire be quenched; and they shall be an abhorring unto all flesh.
WEB: "They shall go forth, and look on the dead bodies of the men who have transgressed against me: for their worm shall not die, neither shall their fire be quenched; and they will be loathsome to all mankind."