I'm probably not understanding the intent of your question, but Coptic didn't become a language in itself until about 200AD and ceased as a language used in every day life by about 1100AD. It wasn't in use to have been applicable in the Old Covenant, since that Covenant was written in Hebrew exclusively, and completed by ca. 500BC... Translations of writings of the New Covenenat into the Coptic language did occur after Mark the Evangelist's introduction of Christianity into Egypt soon after the resurrection of Yeshua, but examples extant today are identical to others of the era, which are identical to the ones in use today...