Leviticus 25:40-45

⁴⁰He shall be with thee as a hireling or a sojourner, he shall work for thee till the year of release:

⁴¹and he shall go out in the release, and his children with him; and he shall go to his family, he shall hasten back to his patrimony.

⁴²Because these are my servants, whom I brought out of the land of Egypt; such an one shall not be sold as a common servant.

⁴³Thou shalt not oppress him with labour, and shalt fear the Lord thy God.

⁴⁴And whatever number of men-servants and maid-servants thou shalt have, thou shalt purchase male and female servants from the nations that are round about thee.

⁴⁵And of the sons of the sojourners that are among you, of these ye shall buy and of their relations, all that shall be in your lands; let them be to you for a possession.