Deuteronomy 15:12
When thy brother is sold to thee, a Hebrew or a Hebrewess, and he hath served thee six years -- then in the seventh year thou dost send him away free from thee.
Jeremiah 34:14
At the end of seven years ye do send forth each his brother, the Hebrew, who is sold to thee, and hath served thee six years, yea, thou hast sent him forth free from thee: and your fathers hearkened not unto Me, nor inclined their ear.
Leviticus 25:39-41
'And when thy brother becometh poor with thee, and he hath been sold to thee, thou dost not lay on him servile service;
Exodus 21:2-6
When thou buyest a Hebrew servant -- six years he doth serve, and in the seventh he goeth out as a freeman for nought;
Deuteronomy 15:1
'At the end of seven years thou dost make a release,
John 8:35-36
and the servant doth not remain in the house -- to the age, the son doth remain -- to the age;