Your friend saw this resource on bethinking.org and thought you should see it:
Does the Bible Condone Slavery?
Bob Price and David Instone-Brewer discuss the Bible's attitude to slavery on Justin Brierley's 'Unbelievable?' radio programme.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/is-religion-harmful/does-the-bible-condone-slavery
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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.