'Slaves' in the Bible

Since they're my servants whom I've brought out of the land of Egypt, they are not to be sold as slaves.

"As for your male and maid slaves who will be with you, you may buy male and female slaves from among the nations.

You may give them as inherited property to your children after you, to own as properties in perpetuity. You may make bond slaves of them, but no one is to rule over his fellow Israeli with harshness.

I am the LORD your God, who brought you out of the land of Egypt so that you will no longer be their slaves, since I've broken their oppressive yoke upon you to make you walk upright."