Reference for Bava Metzia 24:5
אמר רבי חייא בר אבא אמר רבי יוחנן הכא בעבד נוקב מרגליות עסקינן שאין רבו רוצה לשנותו למלאכה אחרת
— R. Hiyya b. Abba said in the name of R. Johanan: The servant referred to here [in our Mishnah] is one [who does highly skilled work, such as] perforating pearls, so that his master does not wish to change him over to any other kind of work.<span class="x" onmousemove="('comment',' The master would therefore not wish him to interrupt his work in order to lift up a found object, the value of which would seldom exceed the value of his work, so that if it does happen that the servant lifts up a valuable object the master can only claim compensation for the time in which he interrupted his work in order to acquire the object. ');"><sup>5</sup></span>
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