But as an hired servant, and as a sojourner, he shall be with thee, and shall serve thee unto the year of jubile:
Exodus 21:2
If thou buy an Hebrew servant, six years he shall serve: and in the seventh he shall go out free for nothing.
Exodus 21:3
If he came in by himself, he shall go out by himself: if he were married, then his wife shall go out with him.