Leviticus 25:43-53

43Do not rule over them ruthlessly, but fear your God. 44“ ‘Your male and female slaves are to come from the nations around you; from them you may buy slaves. 45You may also buy some of the temporary residents living among you and members of their clans born in your country, and they will become your property.

46You can bequeath them to your children as inherited property and can make them slaves for life, but you must not rule over your fellow Israelites ruthlessly. 47“ ‘If a foreigner residing among you becomes rich and any of your fellow Israelites become poor and sell themselves to the foreigner or to a member of the foreigner’s clan, 48they retain the right of redemption after they have sold themselves. One of their relatives may redeem them: 49An uncle or a cousin or any blood relative in their clan may redeem them. Or if they prosper, they may redeem themselves. 50They and their buyer are to count the time from the year they sold themselves up to the Year of Jubilee. The price for their release is to be based on the rate paid to a hired worker for that number of years. 51If many years remain, they must pay for their redemption a larger share of the price paid for them. 52If only a few years remain until the Year of Jubilee, they are to compute that and pay for their redemption accordingly.

53They are to be treated as workers hired from year to year; you must see to it that those to whom they owe service do not rule over them ruthlessly.