Reference for Bava Batra 8:7
<big><strong>מתני׳</strong></big> המקיף את חבירו משלש רוחותיו וגדר את הראשונה ואת השניה ואת השלישית אין מחייבין אותו רבי יוסי אומר אם עמד וגדר את הרביעית מגלגלין עליו את הכל:
said to R. Ashi: Let neither of them make a mark? — The rule is required for the case where one made a mark first, so that if the other does not do likewise, the first may claim [the whole wall] as his own. Is the Tanna then teaching us how to guard against rogues? — And is not the previous regulation also<span class="x" onmousemove="('comment',' That if one builds the fence on his own ground he should make a mark. ');"><sup>6</sup></span>
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