Deuteronomy 15:12
And if thy brother, a Hebrew man, or a Hebrew woman, shall be sold to 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 dismiss ye every man his brother a Hebrew, who hath been sold to thee; and when he hath served thee six years, thou shalt let him go free from thee: but your fathers hearkened not to me, neither inclined their ear.
Leviticus 25:39-41
And if thy brother that dwelleth by thee shall have become poor, and be sold to thee; thou shalt not compel him to serve as a bond servant:
Exodus 21:2-6
If thou shalt buy a Hebrew servant, six years he shall serve: and in the seventh he shall depart 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 for ever.