Midrash su Deuteronomio 23:17

3) (Vayikra 25:40) ("As a hired man and as a sojourner shall he be with you; until the Yovel year shall he work with you.") "As a hired man": Just as a hired man (Devarim 24:15) "On his day shall you give him his hire," so, this one, "On his day shall you give him his hire." "as a sojourner": Just as a sojourner (Devarim 23:17) "… what is good for him; you shall not oppress him," so, this one "… what is good for him; you shall not oppress him." "shall he be with you": "with you" in eating, "with you" in drinking, "with you" in covering — that you not eat a clean loaf and he eat a coarse loaf; that you (not) drink old wine and he drink new wine; that you (not) sleep on cotton and he sleep on straw. "shall he work with you": that he (the master) should not engage him for his craft to another. So that if he (the servant) were formerly a public bath-house attendant, a barber to the public, or a baker to the public, he should not do this (as a servant). R. Yossi says: If this were his trade (before he became a servant) he should do it; but his master should not bid him to do so ab initio. But the sages said: He cuts his (the master's) hair, and washes his garment, and bakes his dough. (Vayikra 25:41) ("Then he shall go out from you; and his children with him. And he shall return to his family, and to the holding of his fathers shall he return.") "Then he shall go out from you": (From this we may infer) that you (the servant) should not be in the village and he in the city, or you in the city and he in the village. "he and his children with him": (from which we may infer) Just as his master is obligated to feed him, so is he obligated to feed his wife and children. I might think, even if he married a woman without the knowledge of his master; it is, therefore, written "he (and his wife) and his children" — Just as he, with the knowledge of his master, so, his wife and children with the knowledge of his master.