Your friend saw this resource on bethinking.org and thought you should see it:
Does the Bible Support Slavery?
Does the Bible condone slavery – at the very least by not condemning it? This lecture examines some of the issues we need to consider.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/bible/does-the-bible-support-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.