Tyler Vela has done a very in-depth look at Biblical Slavery from a Moral and historical perspective.

Here are his articles:

Slavery and the Bible Part 1

Slavery and the Bible Part 2

Slavery and the Bible Part 3

Exodus 21:20-21: A Manual For Beating Slaves?

Collected Works on “Slavery” and the Bible

Here are his Podcast:

Part 1

Part 2

Part 2.1

Part 3

BTWN appearance

Slavery in the Bible and the Ancient Contexts

Biblical Slavery: Why Context is King

Is Exodus 21:20-21 A Manual For Beating Slaves?

Slavery in the OT Law Part 1

Slavery in the OT Law Part 2 – The Foreigner

Dr. Peter Williams:

“Does the Bible Support Slavery?”

Moral Objections to the Old Testament

Triablogue:

Flogging

Slave trade

Runaway slaves

The slave trade

Voluntary slavery

Good Jesus meets bad atheist

Chattel slavery

Economic justice

Dr. Michael Brown:

Michael Brown vs. Joshua Bowen – Was Old Testament Slavery Morally Permissible?

Wesley Huff:

OT and Slavery