'Slave' in the Bible

And it shall be, if thou have no delight in her, then thou shalt let her go according to her desire; but thou shalt in no wise sell her for money; thou shalt not treat her as a slave, because thou hast humbled her.

If a man be found who hath stolen one of his brethren of the children of Israel, and who hath treated him as a slave and sold him, that thief shall die; and thou shalt put evil away from thy midst.

Is Israel a bondman? Is he a home-born slave? Why is he become a spoil?

And it came to pass as we were going to prayer that a certain female slave, having a spirit of Python, met us, who brought much profit to her masters by prophesying.