Exodus 21:2-4

Young's Literal Translation

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;

⁴ if his lord give to him a wife, and she hath borne to him sons or daughters -- the wife and her children are her lord's, and he goeth out by himself.