The ancient Jewish and Jewish Christian documents that are here called Pseudepigrapha have in their long history been problematic and promising in both Jewish and Christian communities. It is heartening to observe that the very publication of this new collection testifies more to their promise than to their problems. An ancient witness to both problem and promise can be found within two late books of the New Testament itself. The Epistle of Jude, in its strong antiheretical polemic, refers at least twice to the language of the book we call I Enoch and in a third instance quotes it in an authoritative manner as prophetic.