It has also been supposed that Jude is quoting an apocryphal book that contained this account, and that Jude means to confirm that the account is true. Origen (c. 185–254), an early Christian scholar and theologian, mentions the book “The Assumption of Moses” as extant in his time, containing this very account of the contest between Michael and the devil about the body of Moses. That book, now lost, was a Jewish Greek book, and Origen supposed that this was the source of the account in Jude.
Ipinagpapalagay din na hango sa isang aklat apokripa ang nilalaman ng talatang ito sa Judas, at nais ni Judas na patunayan na ang mga salaysay na ito ay totoo. Si Origen (c. 185"254), isang sinaunang Kristiyanong iskolar at teologo, ay binanggit ito sa aklat na may titulong "Ang pagakyat sa langit ni Moises" ng siya ay nabubuhay pa, na naglalaman ng mismong bahaging ito ng Judas.