Reference for Bava Kamma 174:7

כדאמר רבא בריה דרב עולא לא נצרכה אלא להעדפה ה"נ לא נצרכה אלא להעדפה

that a master may say to his slave, 'Work with me though I am not prepared to maintain you,' surely this applies only to a Canaanite slave to whom the master can say, 'Do your work during the day and in the evenings you can go out and look about for food,'<span class="x" onmousemove="('comment',' [Eg. where the work he performs is not worth the cost of his maintenance, v. Git. 12a.] ');">¹²</span> whereas in the case of a Hebrew slave in connection with whom it is written, Because he fareth well with thee,<span class="x" onmousemove="('comment',' Deut. XV, 16. ');">¹³</span>

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