Did Justin Martyr Know the Gospel of John?

by Michael Kruger

There has been a long-standing scholarly discussion about how far back we can trace the roots of the fourfold gospel.  We certainly see it in Irenaeus, who is quite plain about his view, “It is not possible that the gospels can be either more or fewer than the number they are.  For, since there are four zones of the world in which we live and four principle winds… [and] the cherubim, too, were four-faced” (Haer. 3.11.8).

But, can we trace the fourfold gospel back even further?  Justin Martyr, an early Christian apologist writing c.150-160, is a key player in this debate.  He clearly knows the Synoptic Gospels—Matthew, Mark and Luke. But did he know John?  Scholars disagree about this. But, I think there are good reasons to think that he did.  Here are a few:

1. We should remember that Justin was the teacher and mentor of Tatian who was famous for producing a harmony of all four gospels known as the Diatesseron.  It is noteworthy not only that John was included in Tatian’s harmony, but that John provided the central chronological backbone for his work. If Tatian valued John so highly, then it is difficult to believe that his mentor, Justin, would have been unaware of this gospel.

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2. At one point, Justin indicates how many gospels he knows when he describes these gospels as “drawn up by His apostles and those who followed them” (Dial 103). Since such language indicates (at least) two gospels written by apostles, and (at least) two written by apostolic companions.  Thus, Justin appears to receive (at least) four core gospels.  Given that we know three of these gospels are Matthew, Mark and Luke, it seems only natural to think the last one would be John.  And if it is not John, then which one is it?

3. Justin clearly knew other Johannine literature, such as the book of Revelation which he regarded as written by the apostle John (Dial 81.4). No doubt his familiarity with Johannine tradition is connected to the fact that he lived in John’s former residence of Ephesus during his dialogue with Trypho. His knowledge of other Johannine works is at least suggestive that he knew John’s gospel…

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