Reference for Bava Metzia 183:15

לא דכולי עלמא משלו הוא אוכל והכא בכנפשך קמיפלגי מר סבר כנפשך בדבר שמוסר נפשו עליו

Whereon Rab commented: Issi makes life impossible for any one.<span class="x" onmousemove="('comment',' Social life is impossible if any person may enter and eat of one's crops. — Now, the first Tanna agrees with Rab, and hence says, only A LABOURER MAY EAT etc.; but the Sages maintain that any person may enter; hence they say that the labourer may eat more than his wage, since even if no wage is due at all — i.e., if he is not an employee he may still eat. ');">¹³</span>

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