Reference for Bava Kamma 40:8

ש"מ זה נהנה וזה לא חסר פטור שאני התם דאמר ליה לדידי סגי לי בנטירא בר זוזא

Come and hear: [In the same case] R. Jose said: [It is only] if the defendant [subsequently] of his own accord makes a fence on the fourth side that there would devolve upon him, a liability to pay his share [also] in the existing fences [made by the plaintiff].<span class="x" onmousemove="('comment',' B.B. 4b. ');">⁶</span>

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