Deuteronomy 18:20- "But a prophet who presumes to speak in my name anything I have not commanded, or a prophet who speaks in the name of other gods, is to be put to death.”
Mr. Camping is very fortunate we live under the new Covenant and not the old.
Also, Nick, I'm quite certain of the prophecy based off a 2000+ year old book:
Mark 13:32 “But about that day or hour no one knows, not even the angels in heaven, nor the Son, but only the Father."
I'm certain every single one of these doomsday prophecies will be wrong.