Your friend saw this resource on bethinking.org and thought you should see it:
Are the Resurrection Accounts Contradictory?
What should we make of claims that differences in the Gospel accounts mean they can't be trusted?
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/did-jesus-rise-from-the-dead/resurrection-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.