Reference for Bava Batra 8:5

ותנא תקנתא לרמאי קמ"ל אמר ליה ורישא לאו תקנתא לרמאי הוא

If he can do that, he can also cut off the points [if they are outside] and throw them away? — [The other should therefore] smear clay over them. But even so the neighbour can come and scrape it away? — Scraping would be noticed. Abaye said [that for a partition made of] palm branches there is no security save by a written deed.<span class="x" onmousemove="('comment',' That is to say, there is always the possibility of fraud unless there is evidence in writing duly witnessed as to how the partition was made. ');">⁴</span>

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