Cross reference
Leviticus 25:40
40 as an hireling, as a settler, he is with thee, till the year of the jubilee he doth serve with thee, --
Exodus 21:2-3
2 `When thou buyest a Hebrew servant -- six years he doth serve, and in the seventh he goeth out as a freeman for nought;
3 if by himself he cometh in, by himself he goeth out; if he `is' owner of a wife, then his wife hath gone out with him;