The Judas Testament is a pejorative term referring to a hypothetical and apocryphal gospel written by an apostle of the historical Jesus or Jesus himself that would severely call into question the historicity of the words and acts attributed to Jesus in the New Testament and create great dismay amongst most devout Christians.
A novel by Daniel Easterman, The Judas Testament, published in 1994, revolved around the discovery of such a Judas testament in Moscow by an Aramaic scholar, who becomes the unwitting pawn in a murderous struggle by various cryptopolitical forces to possess the scroll.
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