'Slave' in the Bible

“Is Israel a servant? Is he a slave by birth?Why has he become a captive and a prey?

“And if you [wonder and] say in your heart,‘Why have these things happened to me?’It is because of the greatness and nature of your sinThat your skirts have been pulled away [subjecting you to public disgrace]And [like a barefoot slave] your heels have been wounded.

“So I Myself will throw your skirts up over your face,That your shame may be exposed [publicly].

All nations shall serve him and his son and his grandson until the [appointed] time [of punishment] for his own land comes; then many nations and great kings shall make him their servant.

that every man should let his Hebrew slaves, male and female, go free, so that no one should make a slave of a Jew, his brother.