"Diabolusdixit", or properly "Diabolus dixit", a paraphrase of the latin phrase "Magister dixit", that means "The Teacher said it", an invalid argument, an appeal to authority, a fallacy.

And, didn't they say that "The Devil is the father of all lies"?

Marlowe wrote once: "Had I as many souls as there be stars, I’d give them all for Mephistophilis"... a high price for such a sophist, or not, who knows?