In my posts on Barnabas I indicated that it was probably written sometime in the 130s CE; I often get asked how scholars come up with dates like that?

The first thing to stress is that it’s is very difficult to date ancient writings.  But scholars who have worked on such matters (for nearly 300 years now, in some instances) have marshaled pretty good evidence in case after case, although in many instances there continue to be substantial debates.

There are several ways to establish parameters, which are fairly commonsensical. If a writing is quoted by an author whose dates are relatively certain (his dates too need to be established on independent grounds! But in lots of cases there is almost no doubt), then obviously the writing is earlier than that. So that’s a beginning. Second,

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