Leviticus 25:44
"However, you may purchase male or female slaves from among the foreigners who live among you. You may also purchase the children of such resident foreigners, including those who have been born in your land. You may treat them as your property, passing them on to your children as a permanent inheritance. You may treat your slaves like this, but the people of Israel, your relatives, must never be treated this way."
Exodus 21:20-21
"20 “Anyone who beats their male or female slave with a rod must be punished if the slave dies as a direct result, 21 but they are not to be punished if the slave recovers after a day or two, since the slave is their property."
Ephesians 6:5
"5 Slaves, obey your earthly masters with respect and fear, and with sincerity of heart, just as you would obey Christ."