It has been suggested that the text derives from an earlier Greek version .
The only copy of it known to exist is a Coptic language text that has been carbon dated to AD 280 , plus or minus 60 years .
copy has been suggested that the text derives from an earlier Greek version .
The only copy of it known to exist is a Coptic language text that has been carbon dated to AD 280 , plus or minus 60 years .