There is no "hellfire" in the Old Testament, as there was no concept of "Hell" in the Jewish thinking before the New Covenant. In fact, there was no belief even in an afterlife of any sort. That is why in the Old Testament so much emphasis is placed on children and families, e.g. Abraham and Sarah...since there was no afterlife, the only way to be remembered and to have one's memory live was by carrying everything on to your children, and thus on to the future. Even Satan is a messenger of God, a helper, appearing in the book of Job.

And don't bring up "The fires of Gehenna" either. Gehenna was the garbage dump in Jerusalem.