In regard to Exodus 23:9 NASB:
You shall not oppress a stranger, since you yourselves know the feelings of a stranger, for you also were strangers in the land of Egypt.
I'm wondering what the difference is between the slavery or servitude system described in Exodus 21:2-11 versus what would be considered oppression in this verse.
Laws About Slavery In Exodus has good information about the servitude system of the time and how it wasn't chattel slavery, but being able to take slaves/servants in this way still seems like a form of oppression by modern standards.
If you're allowed to take people as slaves, what are you not supposed to do? What type of oppression does this verse really refer to?