Deuteronomy 15:12
When thy brother a Hebrew man (or a Hebrew woman) selleth himself unto thee, then shall he serve thee six years, - and in the seventh year, shalt thou let him go out free from thee;
Jeremiah 34:14
At the end of seven years, shall ye let go every man his brother, being a Hebrew, who shall sell himself unto thee and serve thee, six years, then shalt thou let him go, free, from thee, Howbeit your fathers hearkened not unto me neither inclined their ear.
Leviticus 25:39-41
And when thy brother waxeth poor with thee, and so selleth himself unto thee, thou shalt not bind him with the bondage of a bondman:
Exodus 21:2-6
When thou shalt acquire a servant who is a Hebrew, six years, shall he serve, - but in the seventh shall he go out freely - for nought.
Deuteronomy 15:1
At the end of seven years, shalt thou make a release.
John 8:35-36
Now, the slave, doth not abide in the house, evermore. The Son, abideth, evermore.