Your friend saw this resource on bethinking.org and thought you should see it:
How Many Copies of the Gospels?
How many hand-written copies of the Gospel accounts are there? What does this reveal about possible mistakes?
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/jesus/how-many-copies-of-gospels
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bethinking.org is a collection of resources which aims to make sense of the big questions of life about God, Jesus and Christianity.