Deuteronomy 15:14

And if thy brother, an Hebrew man, or an Hebrew woman, be sold unto thee, and serve thee six years; then in the seventh year thou shalt let him go free from thee.

And when thou sendest him out free from thee, thou shalt not let him go away empty:

And thou shalt remember that thou wast a bondman in the land of Egypt, and the LORD thy God redeemed thee: therefore I command thee this thing to day.

And it shall be, if he say unto thee, I will not go away from thee; because he loveth thee and thine house, because he is well with thee;