Deuteronomy 15:12
If thy brother, a Hebrew man, or a Hebrew woman, is sold to thee, and serves thee six years, then in the seventh year thou shall let him go free from thee.
Jeremiah 34:14
At the end of seven years ye shall let go every man his brother who is a Hebrew, who has been sold to thee, and has served thee six years. Thou shall let him go free from thee. But your fathers hearkened not to me, nor inclined the
Leviticus 25:39-41
And if thy brother becomes poor with thee, and sells himself to thee, thou shall not make him to serve as a bondman.
Exodus 21:2-6
If thou buy a Hebrew servant, six years he shall serve, and in the seventh he shall go out free for nothing.
Deuteronomy 15:1
At the end of every seven years thou shall make a release.
John 8:35-36
And the bondman does not remain in the house into the age. The Son remains into the age.