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The Gospel of Thomas may be the earliest record of the Teaching of Jesus ... as early as 40 AD.... Assigning a date to the Gospel of Thomas is very complex because it is difficult to know precisely to what a date is being assigned. Scholars have proposed a date as early as 40 AD or as late as 140 AD, depending upon whether the Gospel of Thomas is identified with the original core of sayings, or with the author's published text, or with the Greek or Coptic texts, or with parallels in other literature."