Deuteronomy 15:12
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.
Jeremiah 34:14
At the end of seven years let ye go every man his brother an Hebrew, which hath been sold unto thee; and when he hath served thee six years, thou shalt let him go free from thee: but your fathers hearkened not unto me, neither inclined their ear.
Leviticus 25:39-41
And if thy brother that dwelleth by thee be waxen poor, and be sold unto thee; thou shalt not compel him to serve as a bondservant:
Exodus 21:2-6
If thou buy an 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 shalt make a release.
John 8:35-36
And the servant abideth not in the house for ever: but the Son abideth ever.