Your friend saw this resource on bethinking.org and thought you should see it:
Are There Contradictions in the Gospels?
Are the Gospels full of contradictions? What would have been seen as normal standards of trustworthy historical writing at that time?
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/jesus/gospel-contradictions
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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.