Your friend saw this resource on bethinking.org and thought you should see it:
Was Jesus' Tomb Really Empty?
Was Jesus' tomb really empty, or was this just a story made up years later?
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/did-jesus-rise-from-the-dead/was-jesus-tomb-really-empty
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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.