'Slaves' in the Bible

‘It shall come about on that day,’ says the Lord of hosts, ‘that I will break the yoke off your neck and I will tear off your bonds and force apart your shackles; and strangers will no longer make slaves of the people [of Israel].

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.

Yet you backed out [of the covenant] and profaned My Name, and each man took back his servants, male and female, whom had been set free in accordance with their desire, and you brought them into servitude [again] to be your male servants and your female servants.”’