'Slaves' in the Bible

"'As for your male and female slaves who may belong to you -- you may buy male and female slaves from the nations all around you.

Also you may buy slaves from the children of the foreigners who reside with you, and from their families that are with you, whom they have fathered in your land, they may become your property.

I am the Lord your God who brought you out from the land of Egypt, from being their slaves, and I broke the bars of your yoke and caused you to walk upright.