Why couldn’t Matthew, Mark, and Luke just have the same stories?  Why do we have to assume someone was copying someone else’s?

In yesterday’s post,  I simply stated that copying must have been going on to explain the literary relationship among Matthew, Mark, and Luke, the Synoptic Gospels, since they have so many similarities: they tell many of the same stories, often in the same sequence, and sometimes – lots of times – in the very same words.  That is to say, someone must be copying someone else, or they are all using the same written sources.

But some of my students have trouble seeing that if two documents are word-for-word the same, one must be copying the other (or they both are copying a third source).  Many older adults don’t seem to have any problem seeing that, right off the bat.  But younger adults need to be convinced.  And so I do a little experiment with them that more or less proves it.  I do this every year in my New Testament class, which normally has 200-300 students in it.

I come to class a minute or two late to make sure everyone is there, and then

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